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weathering

The wearing down of rocks on Earth's surface by wind, water, ice and plants.

erosion

The process by which soil and rock are broken down and moved away.

volcano

An opening in Earth's surface from which lava flows.

canyon

A valley with steep sides.

glacier

A huge block of moving ice.

earthquake

The shaking of Earth's surface.

plateau

A flat area higher than the land around it.

flood

A large amount of water that covers the land.

mountain

A place on Earth's surface that is much higher than the land around it.

landslide

A large chunk of Earth and rock falling down a hill.

landform

A natural shape on Earth's surface which includes both dry lands and ocean floors.

dunes

Hills of sand most common in dry inland areas where lakes or seas once existed.

delta

An areas that forms where a river flows into an ocean, sea or lake.

topography

The shape of landforms in a an area.

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