A process called this makes it possible for people to use seawater for drinking.

The wind drives the ocean's what?

Homes heated by hot springs are an examlpe of the use of what?

Ninety-five to ninety-nine percent of the Sun's what are screened out by the ozone layer?

When hot molten rock from inside Earth rises to the surface and cools to a solid, what are formed?

Oxygen is an example of what?

Tube worms live in a unique environment called what?

Fresh water in constantly renewed through the what?

Chlorine is added to water in a the what?

Water, wind, the tides, and the Sun are examples of what?

Living things need oxygen in the air for what?

Seaweed, oil, coal, and natural gas are examples of important what that oceans provide?

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