Erosion & Deposition. Erosion the process by which natural forces move weathered rock and soil from one place to another.

Erosion & DepositionErosion & Deposition

ErosionErosion

• the process by which natural forces move weathered rock and soil from one place to another

CausesCauses of Erosionof Erosion

• Gravity

• Running water

• Wind

• Glaciers

Causes of ErosionCauses of Erosion

• Gravity = force that moves rock and other materials downhill

– Mass movement—process of moving sediment downhill

– May be fast or slow


• Gravity– Force that moves rock and other

materials downhill – Mass movement—process of

moving sediment downhill – May be fast or slow

– Types of mass movement:• LandslidesLandslides—rock & soil

slide quicklyquickly down a steep

slope


• Gravity– Force that moves rock and other

materials downhill – Mass movement—process of

moving sediment downhill – May be fast or slow

– Types of mass movement:• MudflowsMudflows—rapid downhill

movement of a mixture of

waterwater, rock, and soil


• Gravity– Force that moves rock and other materials downhill – Mass movement—process of moving sediment downhill – May be fast or slow

– Types of mass movement:• SlumpSlump—oneone large masslarge mass of

rock and soil suddenly slips

down a slope


• Gravity– Force that moves rock and other materials downhill – Mass movement—process of moving sediment downhill – May be fast or slow

– Types of mass movement:• CreepCreep—veryvery slowslow downhill

movement of rock and soil


• Running Water = #1 agent of erosion


• Running Water– #1 agent of erosion

– Types of running water:• StreamsStreams

– Small streams = creeks– Large streams = rivers

Colorado River Grand Canyon


• Running Water– #1 agent of erosion

– Types of running

water:• Streams• WavesWaves


• Wind = Blows sediment

Dust Bowl

Sand dunes


• Glaciers = Large masses of moving ice

– Movement

changes the land

beneathbeneath themAlaska

Deposition

• the natural process of laying down sediments in a new location

– creates new

landforms

Deposition

• the natural process of laying down sediments in a new location

– creates new

landforms:• Oxbow lakeOxbow lake—

deposition

blocks offblocks off

part of a river

Deposition• the natural process of laying down sediments

in a new location

– creates new landforms:

• DeltaDelta—sediment is deposited at the endend of a river

Deposition

• deposited sediments are laid down in layers

• layers of sediment are compacted under pressure and eventually form sedimentary rock

Deposition

• deposited sediments are laid down in layers• Layers of sediment are compacted under pressure and

eventually form sedimentary rock

Sedimentary rocks are like ogres and onions…they have layers.

Deposition

• deposited sediments are laid down in layers

• Layers of sediment are compacted under

pressure and eventually form sedimentary

rock

Most fossils are found in Most fossils are found in sedimentary rocks because sedimentary rocks because organisms get covered and organisms get covered and

preserved by the layers preserved by the layers then mineral replacement then mineral replacement

occurs over time.occurs over time.

Weathering, erosion and depositionWeathering, erosion and deposition are all part of a never-ending cycle that are all part of a never-ending cycle that

constantly shapes and reshapes the constantly shapes and reshapes the land.land.

Weathering, erosion and depositionWeathering, erosion and deposition are all part of a never-ending cycle that are all part of a never-ending cycle that

constantly shapes and reshapes the constantly shapes and reshapes the land.land.

DestructiveDestructive forcesforces—break down—break downConstructive forcesConstructive forces—build up—build up

Weathering, erosion and depositionWeathering, erosion and deposition are are all part of a never-ending cycle that all part of a never-ending cycle that

constantly shapes and reshapes the land.constantly shapes and reshapes the land.

ErosionCarries sediment away

DepositionDepositionTakes sediment to a new

location to build new rock layers

WeatheringBreaks down rock

Destructive Forces

Destructive Forces

Constructive Constructive ForcesForces

Erosion & Deposition. Erosion the process by which natural forces move weathered rock and soil from one place to another.

Documents

slowtypes of mass movement

slumpone large mass

weathered rock

layerslayers of sediment

mixture of water

natural forces

neverending cycle

agent of erosiontypes