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Read on to find out. Water is never sitting still. Things would get pretty stale without the water cycle!


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Are you surprised that these water spheres look so small? They are only small in relation to the size of the Earth.

UN Global Compact

This image attempts to show three dimensions, so each sphere represents "volume. The smaller sphere over Kentucky represents Earth's liquid fresh water in groundwater, swamp water, rivers, and lakes.

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The volume of this sphere would be about 2,, mi 3 10,, km 3 and form a sphere about Yes, all of this water is fresh water, which we all need every day, but much of it is deep in the ground, unavailable to humans. Do you notice the "tiny" bubble over Atlanta, Georgia? That one represents fresh water in all the lakes and rivers on the planet.

Most of the water people and life on earth need every day comes from these surface-water sources.

Liquid water

The diameter of this sphere is about Yes, Lake Michigan looks way bigger than this sphere, but you have to try to imagine a bubble almost 35 miles high—whereas the average depth of Lake Michigan is less than feet 91 meters. The freshwater resources, such as water falling from the skies and moving into streams, rivers, lakes, and groundwater, provide people with the water they need every day to live. But, the unseen water below our feet is critically important to life, also.

How do you account for the flow in rivers after weeks without rain? In fact, how do you account for the water flowing down a driveway on a day when it didn't rain? The answer is that there is more to our water supply than just surface water, there is also plenty of water beneath our feet. Patron Sponsors. Event Sponsors. This website uses cookies to improve your experience.

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We'll assume you're ok with this, but you can opt-out if you wish. Privacy Overview This website uses cookies to improve your experience while you navigate through the website. Privacy Overview. Necessary Always Enabled. Non-necessary Non-necessary. We are nestled in our solar system at just the right distance from the Sun for this liquid water to exist. Any farther and that water would be frozen in ice. But how did that water get here? Water is a defining characteristic of our planet and it plays such an important part of our daily lives. Understanding how water arrived on Earth is a key part of understanding how and when life evolved here as well.

Scientists are still actively researching how our planet got to be so wet in the first place.

As the grains of dust and ice in the disk interact with themselves, those grains begin to form bigger and bigger clumps. Eventually those clumps form what we call planetesimals, the building blocks of rocky and giant planets. So even though there were most likely water molecules present in the mess of debris that made up the disk, it was too hot for water to condense into a liquid, causing it to evaporate instead.

Water | H2O | ChemSpider

This leaves us with a bit of a puzzle. If the Earth could not have formed from the disk with its oceans already intact, how did they get here? Not sure of the difference between an asteroid and a comet?