With more than ____ of Earth's surface covered in water, water is one of the planet's most abundant ____ resources. Thanks to the natural ____ (water cycle), water on Earth is continuously recycled. In this process, water shifts between solid, ____, and gaseous forms, occupying all three states of ____ at varying times. As water moves between land, the oceans, and the ____, the distribution of water (where it is located or in what state) is always changing, but the total amount of water on Earth stays approximately the ____. Amazingly, the water on Earth today is estimated to be more than a ____ years old!

Water Cycle

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