How much water does the earth have?
With all the rain we’ve had lately, it may seem like the earth is made completely of water. In some ways, it is. We have oceans, lakes, rivers, and even water squeezed into tiny pockets in rock and clay. An oceanographer in Hawaii has recently been trying to estimate just how much water the earth has. His conclusion? Water makes up less than 0.1% of the mass of the Earth.
Compared to some heavenly bodies (Europa, a moon of Jupiter for example) that are made almost entirely of water, we are very dry. They may have more water, but at least we have some sunshine!
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