Types of erosion

What is erosion?

ErosionThe movement of weathered materials by

wind, water, or ice.

Chemical & Physical Weathering

• Weathering is the process rocks break down.

• A rock can be broken down in 2 different ways.

• Chemical weathering is when a rock is dissolved over time.

• Physical weathering is when the rocks shape is changed.

PhysicalWeathering

Constant freezing, and thawing of water penetrates into the rock’s

joints

Chemical WeatheringChemicals in rainwater dissolve a type of rock called limestone

over a long period of time.

Oxidation Is the interaction between

oxygen molecules and all the different substances they may contact, from metal to living

tissue

Acid Rain

Rain that contains unhealthy amounts of acid is called acid rain.

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Alluvial fanShallow, flat area formed where a

deep fast moving stream slows down, widens and deposits its

sediment Hint: comes down a mountain

DeltaTriangle- shaped area at the

mouth of a river formed when the river reaches its base level, slows down, and deposits its

sediment.

FloodplainBroad, flat area surrounding a

stream, close enough in elevation so that occasional flooding occurs.

LeveeA natural bank confining a stream

channel

Meander

A curve or bend in a streambed.

Sediment

Bits of rock, soil, sand, shells, and remains of organisms.

GlacierA large body of moving ice

Glacial Till

This is the name given to the silt, sand, and rocks.

Permeable

The rate at which water

passes through a material

Tidal ActionThe alternating rise and fall

of the ocean’s surface level, caused by the

gravitational pull of the Moon and Sun on

Earth.

Dune

A hill of sand that is deposited by the wind