A flat area that rises above the surrounding land.

A large expanse of land that can be flat or have a gentle roll.

A narrow strip of land that connects two larger land areas.

The part of a continent that extends into the ocean, then drops off sharply.

A long, narrow, steep-sided cut on the ocean floor.

A process that makes salt water safe to drink.

The water contained inside Earth's crust.

An area where sand, silt, clay, or gravel is dropped at the mouth of a river.

The process in which water is used and reused on Earth.

The change of liquid water to water vapor.

The change of water vapor to a liquid or solid state.

Rain that contains harmful amounts of poisons due to pollution.

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