Canyon

Deep valley with steep sides carved by a river.

Geyser

A natural hot spring that intermittently ejects a column of water and steam into the air.

Fjord

A long narrow deep inlet of the sea between steep slopes.

Volcano

An opening in the earth's crust through which molten lava ash and gasses are ejected.

Glacier

Large slow moving mass of ice.

Island

Body of land that is surrounded entirely by water.

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