The water cycle has no starting point, but we'll begin in the oceans, since that is where most of Earth's water exists. Air currents move clouds around the globe, and cloud particles collide, grow, and fall out of the sky as precipitation. During colder climatic periods more ice caps and glaciers form, and enough of the global water supply accumulates as ice to lessen the amounts in other parts of the water cycle. Evaporation from the oceans is the primary mechanism supporting the surface-to-atmosphere portion of the water cycle.
Sublimation describes the process of snow and ice changing into water vapor without first melting into water. Sublimation occurs more readily when certain weather conditions are present, such as low relative humidity and dry winds. Evapotranspiration: The process by which water vapor is discharged to the atmosphere as a result of evaporation from the soil and transpiration by plants. Although some definitions of evapotranspiration include evaporation from surface-water bodies, such as lakes and even the ocean, on this Web site, evapotranspiration is defined as the water lost to the atmosphere from the ground surface and the transpiration of groundwater by plants through their leaves. Transpiration is the process by which moisture is carried through plants from roots to small pores on the underside of leaves, where it changes to vapor and is released to the atmosphere. Temperature:Transpiration rates go up as the temperature goes up, especially during the growing season, when the air is warmer. Relative humidity: As the relative humidity of the air surrounding the plant rises the transpiration rate falls.
Wind and air movement: Increased movement of the air around a plant will result in a higher transpiration rate.
Soil-moisture availability: When moisture is lacking, plants can begin to senesce (premature ageing, which can result in leaf loss) and transpire less water. Even though clouds are absent in a crystal clear blue sky, water is still present in the form of water vapor and droplets which are too small to be seen. As we said, clouds form in the atmosphere because air containing water vapor rises and cools.
Precipitation is water released from clouds in the form of rain, freezing rain, sleet, snow, or hail.
The clouds floating overhead contain water vapor and cloud droplets, which are small drops of condensed water. Precipitation does not fall in the same amounts throughout the world, in a country, or even in a city. The map below shows average annual precipitation, in millimeters and inches, for the world. On average, the 48 continental United States receives enough precipitation in one year to cover the land to a depth of 30 inches (0.76 meters).
Although the water cycle sounds like it is describing the movement of water, in fact, much more water is in storage at any one time than is actually moving through the cycle. The vast majority, almost 90 percent, of Earth's ice mass is in Antarctica, while the Greenland ice cap contains 10 percent of the total global ice-mass. The climate, on a global scale, is always changing, although usually not at a rate fast enough for people to notice. According to the National Snow and Ice Data Center (NSIDC), if all glaciers melted today the seas would rise about 230 feet (70 meters). During the last ice age (when glaciers covered more land area than today) the sea level was about 400 feet (122 meters) lower than it is today.
During the last warm spell, 125,000 years ago, the seas were about 18 feet (5.5 meters) higher than they are today.
If you live in Florida or on the French Riviera you might not wake up everyday wondering how melting snow contributes to the water cycle.
A good way to visualize the contribution of snowmelt to streamflow in rivers is to look at the hydrograph below, which shows daily mean streamflow (average streamflow for each day) for four years for the North Fork American River at North Fork Dam in California (real-time data streamflow). Many people probably have an overly-simplified idea that precipitation falls on the land, flows overland (runoff), and runs into rivers, which then empty into the oceans. As with all aspects of the water cycle, the interaction between precipitation and surface runoff varies according to time and geography.
One part of the water cycle that is obviously essential to all life on Earth is the freshwater existing on the land surface. The amount of water in our rivers and lakes is always changing due to inflows and outflows. As this satellite picture of the Nile Delta in Egypt shows, life can even bloom in the desert if there is a supply of surface water (or groundwater) available. Freshwater represents only about three percent of all water on Earth and freshwater lakes and swamps account for a mere 0.29 percent of the Earth's freshwater.
Anywhere in the world, a portion of the water that falls as rain and snow infiltrates into the subsurface soil and rock. Some water that infiltrates will remain in the shallow soil layer, where it will gradually move vertically and horizontally through the soil and subsurface material. I hope you appreciate my spending an hour in the blazing sun to dig this hole at the beach. In a way, this hole is like a dug well used to access groundwater, albeit saline in this case.
Some of the precipitation that falls onto the land infiltrates into the ground to become groundwater. As this diagram shows, the direction and speed of groundwater movement is determined by the various characteristics of aquifers and confining layers (which water has a difficult time penetrating) in the ground.
A spring is a water resource formed when the side of a hill, a valley bottom or other excavation intersects a flowing body of groundwater at or below the local water table. Springs may be formed in any sort of rock, but are more prevalent in limestone and dolomite, which fracture easily and can be dissolved by rainfall that becomes weakly acidic. Thermal springs are ordinary springs except that the water is warm and, in some places, hot, such as in the bubbling mud springs in Yellowstone National Park, Wyoming. Notice how of the world's total water supply of about 332.5 million cubic miles of water, over 97 percent is saline.
What You'll Be CreatingIn this tutorial I'll show you how you can sketch in Illustrator in a natural fluid style, almost as if you're drawing with pen and paper. To draw this sketch we'll be using plug-ins from Astute Graphics, which will help us to work naturally and make drawing more fun.
If you've ever studied a book on drawing, you'll know that drawing begins with creating basic shapes. You can position the objects from now on with the help of the Smart Guides mode (View > Smart Guides (Control-U)) and Align panel (Window > Align (Shift-F7)).
Using the Rectangle Tool (M) create a rectangle that is elongated in the vertical direction as shown in the image below. Just as a side note, this process can be greatly streamlined by using the Dynamic Shapes Tool from the VectorScribe plug-in, as this enables you to change the object's parameters not only during the process, but also afterwards. After installing the DynamicSketch plug-in, the DynamicSketch icon will appear in the Tools panel. For more information on this tool's settings, you can read from the Overview: Dynamic Sketch Preferences.
As with the Paintbrush Tool (B), we're able to set the relationship between the variable stroke width and several parameters. If you're using a graphic tablet in your work, you'll need to set the relationship between the stroke width and the pressure of the stylus. At the bottom of the Dynamic Sketch panel, you can see a diagram of the dependence of the stroke width to the change in the selected parameter.
I draw using a graphic tablet, so I've chosen Stylus Pressure and linear relationship in the panel.
Secondly, you don't need to keep an eye on the hatching so that it's exactly within the outline of the object.
Finally, to create the wooden texture, I've drawn a few wavy lines resembling typical fibers. This process isn't significantly different from drawing the anchor, so I'm only showing the main stages here. Draw the outline of the lighthouse with variable stroke paths using the DynamicSketch Tool. In this step, I used the Stylus Pressure option and the Gesture Trimming function to remove unwanted segments (to clean up the illustration). WidthScribe is a unique plug-in which really enhances your vector work by varying multiple width strokes simultaneously with both ease and speed. A negative value of this parameter will mean we can reduce the width of paths in the impact area. Usually at the edges of an object the shadow becomes less dense due to reflections from the surrounding environment. We've been able to achieve our desired result in just ten seconds although more than one hundred paths were processed in that time!
In the Layers panel, locate and select the groups of paths to which you want to apply the width gradient. Take the next tool of WidthScribe, the Width Selector Tool, and open its panel (Window > WidthScribe > Width Selector panel). Continuing with a nautical theme we can use the Dynamic Sketch Tool or Pencil Tool (N) to create an arbitrary shape with a blue fill. Step 2Recolor the objects of the lighthouse in a dark blue color, then place it on the blue background, as shown below. Recolor all the objects of the anchor in white and place it at the forefront of your composition. It's impossible to cover all the features and tools of DynamicSketch and WidthScribe in just one tutorial. Along with beautiful polar auroras, faint ring and other effects, amazing you during the orbital flight around this King of Planets.
Some precipitation falls as snow and can accumulate as ice caps and glaciers, which can store frozen water for thousands of years.
You might think that the water in the oceans moves around because of waves, which are driven by winds. Evaporation is the primary pathway that water moves from the liquid state back into the water cycle as atmospheric water vapor. After all, the large surface area of the oceans (over 70 percent of the Earth's surface is covered by the oceans) provides the opportunity for such large-scale evaporation to occur. One way to see the results of sublimation is to hang a wet shirt outside on a below-freezing day. It also occurs more at higher altitudes, where the air pressure is less than at lower altitudes.
Some plants which grow in arid regions, such as cacti and succulents, conserve precious water by transpiring less water than other plants. Although the atmosphere may not be a great storehouse of water, it is the superhighway used to move water around the globe. Condensation is crucial to the water cycle because it is responsible for the formation of clouds.


Condensation is responsible for ground-level fog, for your glasses fogging up when you go from a cold room to the outdoors on a hot, humid day, for the water that drips off the outside of your glass of iced tea, and for the water on the inside of your home windows on a cold day.
Depending on meteorological conditions, water molecules will combine with tiny particles of dust, salt, and smoke in the air to form cloud droplets, which grow and develop into clouds, a form of water we can see. It is the primary connection in the water cycle that provides for the delivery of atmospheric water to the Earth. These droplets are way too small to fall as precipitation, but they are large enough to form visible clouds. Here in Georgia, USA, it rains fairly evenly all during the year, around 40-50 inches (102-127 centimeters (cm)) per year.
By storage, we mean water that is locked up in its present state for a relatively long period of time, such as in ice caps and glaciers. There have been many warm periods, such as when the dinosaurs lived (about 100 million years ago) and many cold periods, such as the last ice age of about 20,000 years ago.
About three million years ago the seas could have been up to 165 feet (50.3 meters) higher.
But, in the world-wide scheme of the water cycle, runoff from snowmelt is a major component of the global movement of water. The large peaks in the chart are mainly the result of melting snow, although storms can contribute runoff also. Compare the high peaks of streamflows for the year 2000 with the much smaller streamflows for 2001. It is easy to see if it flows down your driveway to the curb and into a storm sewer, but it is harder to notice it flowing overland in a natural setting. Similar storms occurring in the Amazon jungle and in the desert Southwest of the United States will produce different surface-runoff effects. Not only are rivers a great place for people (and their dogs) to play, but people use river water for drinking-water supplies and irrigation water, to produce electricity, to flush away wastes (hopefully, but not always, treated wastes), to transport merchandise, and to obtain food. Inflows to these water bodies will be from precipitation, overland runoff, groundwater seepage, or tributary inflows.
Water on the land surface really does sustain life, and this is as true today as it was millions of years ago. It is a great way to illustrate the concept of how at a certain depth the ground, if it is permeable enough to hold water, is saturated with water. But, if this was freshwater, people could grab a bucket an supply themselves with the water they need to live their daily lives. Once in the ground, some of this water travels close to the land surface and emerges very quickly as discharge into streambeds, but, because of gravity, much of it continues to sink deeper into the ground. Water moving below ground depends on the permeability (how easy or difficult it is for water to move) and on the porosity (the amount of open space in the material) of the subsurface rock. A spring is the result of an aquifer being filled to the point that the water overflows onto the land surface.
Water from some springs, however, may be "tea-colored." This picture shows a natural spring in southwestern Colorado. Many thermal springs occur in regions of recent volcanic activity and are fed by water heated by contact with hot rocks far below the surface. By now, you know that the water cycle describes the movement of Earth's water, so realize that the chart and table below represent the presence of Earth's water at a single point in time. Gleick (editor), 1993, Water in Crisis: A Guide to the World's Fresh Water Resources (Oxford University Press, New York).
The plug-ins DynamicSketch and WidthScribe have various intuitive tools and features to simplify your work flow and offer functionality that is nowhere in Adobe Illustrator or any other vector editor.
In the opened dialog box, set the parameters of the artboard and choose the color mode depending on how you want to use your created image.
Sticking to the boundaries of these shapes, beginner artists can easily keep the basic proportions and symmetry of an illustrated object.
Select to the bottom tip of the triangle using the Direct Selection Tool (A), then move it up a little while holding Shift. If you use a mouse for drawing, then you need to set the relationship between the stroke width and the cursor speed (Sketching speed).
By default, this diagram shows a linear relationship, but you can edit it (add points, move, bend, etc.), to set up the tool to work how you want it to. The distance between the hatches and the thickness should correspond to the density of the shadow in this area. As mentioned above, you can easily remove unwanted parts of the paths using the Gesture Trimming function. For example, on the anchor's ring I've created arc-like strokes in order to convey the nature of the surface. Create the basic shape of a lighthouse by using Adobe Illustrator's native tools and features. Here you can use the feature of drawing straight-line segments, included in the Shift modifier. The Width Gradient Tool doesn't change the color like a normal gradient does, but it changes the widths of paths. However, I hope this example shows you how intuitive they are and how they can help you to enjoy being creative by streamlining your work flow. Water set free by magma began to cool down the Earth's atmosphere, and eventually the environment became cool enough so water could stay on the surface as a liquid.
Some of it evaporates as vapor into the air; a relatively smaller amount of moisture is added as ice and snow sublimate directly from the solid state into vapor.
Snowpacks in warmer climates often thaw and melt when spring arrives, and the melted water flows overland as snowmelt. Some of the water infiltrates into the ground and replenishes aquifers (saturated subsurface rock), which store huge amounts of freshwater for long periods of time. During the last ice age glaciers covered almost one-third of Earth's land mass, with the result being that the oceans were about 400 feet (122 meters) lower than today. Studies have shown that the oceans, seas, lakes, and rivers provide nearly 90 percent of the moisture in our atmosphere via evaporation, with the remaining 10 percent being contributed by plant transpiration. On a global scale, the amount of water evaporating is about the same as the amount of water delivered to the Earth as precipitation.
It is estimated that about 10 percent of the moisture found in the atmosphere is released by plants through transpiration. These clouds may produce precipitation, which is the primary route for water to return to the Earth's surface within the water cycle. Cloud droplets can vary greatly in size, from 10 microns (millionths of a meter) to 1 millimeter (mm), and even as large as 5 mm.
Summer thunderstorms may deliver an inch or more of rain on one suburb while leaving another area dry a few miles away.
You might expect the Sahara area in Africa to be a desert, but did you think that much of Greenland and Antarctica are deserts?
The ice cap became so large over time (about 600,000 cubic miles (mi3) or 2.5 million cubic kilometers (km3)) because more snow fell than melted. During the last ice age much of the northern hemisphere was covered in ice and glaciers, and, as this map from the University of Arizona shows, they covered nearly all of Canada, much of northern Asia and Europe, and extended well into the United States. In the colder climates much of the springtime runoff and streamflow in rivers is attributable to melting snow and ice. Compare the fact that minimum mean-daily streamflow during March of 2000 was 1,200 cubic feet per second (ft3), while during August streamflows ranged from 55-75 ft3. Still, it is true that much of the water in rivers comes directly from runoff from the land surface, which is defined as surface runoff. Surface runoff is affected by both meteorological factors and the physical geology and topography of the land. Rainfall causes rivers to rise, and a river can even rise if it only rains very far up in the watershed—remember that water that falls in a watershed will eventually drain by the outflow point. Surface water includes the streams (of all sizes, from large rivers to small creeks), ponds, lakes, reservoirs (man-made lakes), and freshwater wetlands. I'm sure dinosaurs held their meetings at the local watering hole 100 million years ago, just as antelopes in Africa do today. Infiltration of precipitation falling on the ice cap of Greenland might be very small, whereas, as this picture of a stream disappearing into a cave in southern Georgia, USA shows, a stream can act as a direct funnel right into groundwater! Most of the water in the ground comes from precipitation that infiltrates downward from the land surface. If the water meets the water table (below which the soil is saturated), it can move both vertically and horizontally. If the rock has characteristics that allow water to move relatively freely through it, then groundwater can move significant distances in a number of days.
They range in size from intermittent seeps, which flow only after much rain, to huge pools with a flow of hundreds of millions of liters per day.
Its red iron coloring and metals enrichment are caused by groundwater coming in contact with naturally occurring minerals present as a result of ancient volcanic activity in the area.
Even where there has been no recent volcanic action, rocks become warmer with increasing depth. If you check back in a thousand or million years, no doubt these numbers will be different! If you're planning to print your artwork choose the CMYK color mode and if you only want to publish your artwork on the web then choose the RGB color mode.
You may have to extend the panel by opting for Expand Panel from the panel's fly-out menu.
To do this, select the hatching, and then draw on it from top to bottom using the Width Brush Tool. To see how it works, choose a linear gradient and set the starting and ending width of the paths. More details along with instructional product movies (Dynamic Sketch, WidthScribe) will help you get the most from these extremely effective plug-ins!. Earth's water is always in movement and is always changing states, from liquid to vapor to ice and back again. Volcanic activity kept and still keeps introducing water into the atmosphere, thus increasing the surface-water and groundwater volume of the Earth. Rising air currents take the vapor up into the atmosphere, along with water from evapotranspiration, which is water transpired from plants and evaporated from the soil.
Most precipitation falls back into the oceans or onto land, where, due to gravity, the precipitation flows over the ground as surface runoff.
Some infiltration stays close to the land surface and can seep back into surface-water bodies (and the ocean) as groundwater discharge, and some groundwater finds openings in the land surface and emerges as freshwater springs.
A state of saturation exists when these two process rates are equal, at which point, the relative humidity of the air is 100 percent.
If I was to pick one place on Earth where sublimation happens a lot, I might choose the south side of Mt. Clouds are, of course, the most visible manifestation of atmospheric water, but even clear air contains water—water in particles that are too small to be seen. This process occurs higher in the sky where the air is cooler and more condensation occurs relative to evaporation.


If you look closely at a cloud you can see some parts disappearing (evaporating) while other parts are growing (condensation). But, the rain amount that Georgia gets in one month is often more than Las Vegas, Nevada observes all year. The effect of snowmelt on potential flooding, mainly during the spring, is something that causes concern for many people around the world.
The lack of water stored as snowpack in the winter can affect the availability of water (for streamflow) in streams the rest of the year. Only about a third of the precipitation that falls over land runs off into streams and rivers and is returned to the oceans. Rivers even help keep the aquifers underground full of water by discharging water downward through their streambeds. The definition of freshwater is water containing less than 1,000 milligrams per liter of dissolved solids, most often salt. Humans get into the act also, as people make great use of diverted surface water for their needs. And, since groundwater is supplied by the downward percolation of surface water, even aquifers are happy for water on the Earth's surface.
If the aquifers are shallow or porous enough to allow water to move freely through it, people can drill wells into the aquifer and use the water for their purposes. The upper layer of the soil is the unsaturated zone, where water is present in varying amounts that change over time, but does not saturate the soil.
The breaking waves of the ocean are just to the right of this hole, and the water level in the hole is the same as the level of the ocean. As part of the water cycle, groundwater is a major contributor to flow in many streams and rivers and has a strong influence on river and wetland habitats for plants and animals. Water moving downward can also meet more dense and water-resistant non-porous rock and soil, which causes it to flow in a more horizontal fashion, generally towards streams, the ocean, or deeper into the ground. But groundwater can also sink into deep aquifers where it takes thousands of years to move back into the environment, or even go into deep groundwater storage, where it might stay for much longer periods.
In Florida, many surface waters contain natural tannic acids from organic material in subsurface rocks, and the color from these streams can appear in springs. In such areas water may migrate slowly to considerable depth, warming as it descends through rocks deep in the Earth. So, take the Ellipse Tool (L) and create two circles without a fill and with a stroke of any color and thickness. You can also set the minimum and maximum stroke width to correspond to the stylus pressure or cursor speed.
The water cycle has been working for billions of years and all life on Earth depends on it continuing to work; the Earth would be a pretty stale place without it. A portion of runoff enters rivers in valleys in the landscape, with streamflow moving water towards the oceans.
Yet more groundwater is absorbed by plant roots to end up as evapotranspiration from the leaves. It is estimated that of the 332,600,000 cubic miles (mi3) (1,386,000,000 cubic kilometers (km3)) of the world's water supply, about 321,000,000 mi3 (1,338,000,000 km3) is stored in oceans.
Condensation, the opposite of evaporation, occurs when saturated air is cooled below the dew point (the temperature to which air must be cooled at a constant pressure for it to become fully saturated with water), such as on the outside of a glass of ice water. Evaporation is more prevalent over the oceans than precipitation, while over the land, precipitation routinely exceeds evaporation. The fog you see in the picture is a mixture of cold carbon dioxide gas and cold, humid air, created as the dry ice sublimates. One estimate of the volume of water in the atmosphere at any one time is about 3,100 cubic miles (mi3) or 12,900 cubic kilometers (km3). As water droplets combine (also known as coalescence) with each other, and grow in size, clouds not only develop, but precipitation may also occur.
Most of the condensed water in clouds does not fall as precipitation because their fall speed is not large enough to overcome updrafts which support the clouds. The ice cap averages about 5,000 feet (1,500 meters) in thickness, but can be as thick as 14,000 feet (4,300 meters).
This can have an effect on the amount of water in reservoirs located downstream, which in turn can affect water available for irrigation and the water supply for cities and towns. This picture gives a graphic example of how surface runoff (here flowing off a road) enters a small creek.
And, we've already mentioned that the oceans stay full of water because rivers and runoff continually refreshes them.
A watershed is the area of land where all of the water that falls in it and drains off of it goes into the same place. Large rivers have watersheds with lots of surface area; small rivers have smaller watersheds. So, the amount and location of surface water changes over time and space, whether naturally or with human help. You might think that fish living in the saline oceans aren't affected by freshwater, but, without freshwater to replenish the oceans they would eventually evaporate and become too saline for even the fish to survive.
You can see that life on Earth survives on what is essentially only a "drop in the bucket" of Earth's total water supply! Water may travel long distances or remain in groundwater storage for long periods before returning to the surface or seeping into other water bodies, such as streams and the oceans. Below this layer is the saturated zone, where all of the pores, cracks, and spaces between rock particles are saturated with water.
Of course, the water level here changes by the minute due to the movement of the tides, and as the tide goes up and down, the water level in the hole moves, too. People have been using groundwater for thousands of years and continue to use it today, largely for drinking water and irrigation. If surface water enters the aquifer near a spring, the water can move quickly through the aquifer and discharge at the spring vent. If it then reaches a large crevice that offers a path of less resistance, it may rise more quickly than it descended.
Choose Adjust Width by Fixed Amount, set -1.5 px and also Pressure if you're using a graphics tablet.
About three million years ago the oceans could have been up to 165 feet (50 meters) higher. In fact, the process of evaporation removes heat from the environment, which is why water evaporating from your skin cools you.
Most of the water that evaporates from the oceans falls back into the oceans as precipitation. Low temperatures, strong winds, intense sunlight, very low air pressure - just what is needed for sublimation to occur. That may sound like a lot, but it is only about 0.001 percent of the total Earth's water volume. Precipitation is essentially water cloud in its liquid or solid form falling form the base of a cloud. The pressure (weight), called barometric pressure, that results is a consequence of the density of the air above.
For precipitation to happen, first tiny water droplets must condense on even tinier dust, salt, or smoke particles, which act as a nucleus. The runoff in this case is flowing over bare soil and is depositing sediment into the river (not good for water quality).
Watersheds can be as small as a footprint in the mud or large enough to encompass all the land that drains water into the Mississippi River where it enters the Gulf of Mexico. Certainly during the last ice age when glaciers and snowpacks covered much more land surface than today, life on Earth had to adapt to different hydrologic conditions than those which took place both before and after.
But the concept is the same as our well at the beach—access the water in the saturated zone where the voids in the rock are full of water. The discharge of highly colored water from springs can indicate that water is flowing quickly through large channels within the aquifer without being filtered through the limestone. It is also estimated that the oceans supply about 90 percent of the evaporated water that goes into the water cycle.
The Gulf Stream is a well known stream of warm water in the Atlantic Ocean, moving water from the Gulf of Mexico across the Atlantic Ocean towards Great Britain. Only about 10 percent of the water evaporated from the oceans is transported over land and falls as precipitation. If all of the water in the atmosphere rained down at once, it would only cover the ground to a depth of 2.5 centimeters, about 1 inch. This seems to happen too often during picnics or when large groups of people gather at swimming pools. Water droplets may grow as a result of additional condensation of water vapor when the particles collide. A remarkable 642 inches (1,630 cm) was reported there during one twelve-month period (that's almost 2 inches (5 cm) every day!). And the layout of the landscape certainly was different before and after the last ice age, which influenced the topographical layout of many surface-water bodies today.
At a speed of 60 miles (97 kilometers) per day, the Gulf stream moves 100 times as much water as all the rivers on Earth.
The barometric pressure is lower, and lower barometric pressure is associated with fewer molecules per unit volume.
If enough collisions occur to produce a droplet with a fall velocity which exceeds the cloud updraft speed, then it will fall out of the cloud as precipitation. It all depends of the outflow point—all of the land above that drains water that flows to the outflow point is the watershed for that outflow location. In a small watershed, a storm can cause 100 times as much water to flow by each minute as during baseflow periods, but the river will rise and fall possibly in a matter of minutes and hours. Aquifers are a huge storehouse of Earth's water and people all over the world depend on groundwater in their daily lives. And, yes, warm springs can even coexist with icebergs, as these happy Greenlanders can tell you. This is not a trivial task since millions of cloud droplets are required to produce a single raindrop. No, that was recorded at Cherrapunji, India, where it rained 905 inches (2,300 cm) in 1861. Since fewer air molecules exist in a certain volume of air, there are fewer molecules colliding with each other, and as a result, there will be less heat produced.
After all, it can take days for all the water that fell hundreds of miles upstream to drain past an outflow point.



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