Little of Earth's water is usable freshwater
Water is vital to every living creature on earth. Even though we are the blue planet, our fresh water supply on earth is fixed. The earth is a closed system, which means that the same water that existed on Earth millions of years ago is still here. Water exists in many forms on earth, and is continually cycling through these different forms: oceans, glaciers, ground water, clouds, lakes and rivers to name a few.
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