How much of the earth's water is not available for human consumption because it is salt water

What form is most of earth's freshwater in

How much of earth's freshwater can we actually use?

Why is the ocean salty

This type of pollution is too widespread to identify the problem

Where is most of our drinkable water

This is the process of removing salt from salt water to make it freshwater.

What supports life at the bottom of the ocean?

What is one benefit of estuaries

Estuaries are ..

what zone of the ocean are hydrothermal vents located

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