![]() ![]() About 2% of the water on Earth is frozen in ice sheets near the poles and in glaciers. Of all the water in the hydrosphere, the vast majority, about 97% of it, fills the ocean. If you could put all that water together – like a gigantic water drop – it would be 1,500 kilometers (930 miles) across. It includes the water that’s in the atmosphere as clouds and vapor. It includes frozen water in snow, ice, and glaciers, and water that’s underground in soils and rocks. There are about 1.4 billion km 3 of water (336 million mi 3 of water) on Earth. That includes liquid water in the ocean, lakes, and rivers. ![]() ![]() It moves from place to place through the water cycle. Water is in the atmosphere, on the land, in the ocean, and underground. And the water you see in a river or stream may have been snow on a high mountaintop. Rain falling today may have been water in a distant ocean days before. All of the water on Earth makes up the hydrosphere.
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