A volcano is a vent in the earth's crust. when it erupts it spews out lava.

A body of land surrounded by water on 3 sides

A coral reef is a rock with the growth of Coral

An archipelago is a chain or group of islands

A Canyon is a deep valley with steep sides

A geyser is a natural hot spring that shoots out hot steam to the surface

A trench is a long and narrow ditch

A rapid is a fast-flowing part of a river

A desert is a very, very dry area

A glacier is a slowly moving river of ice on land

A plain is a flat land with very little hills

A bowl-shaped hole in the earth's surface

A swamp is a fresh water wet land with muddy land around it