Erosion & Deposition. Erosion and Deposition Weathering –the process by which natural forces break down rock and soil

Erosion & DepositionErosion & Deposition

Erosion and DepositionErosion and Deposition

• Weathering – the process by which natural forces

break down rock and soil


• Erosion – the process by which natural forces move

weathered rock and soil from one place to another


• Erosion – Causes of 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:• Landslides—rock & soil

slide quickly 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:• Mudflows—rapid downhill

movement of a mixture of

water, 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:• Slump—one large 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:• Creep—very slow downhill

movement of rock and soil


• Running Water

– #1 agent of erosion


• Running Water– #1 agent of erosion

– Types of running water:• Streams

– Small streams = creeks– Large streams = rivers

Colorado River Grand Canyon


• Running Water– #1 agent of erosion

– Types of running

water:• Waves


• Wind– Blows sediment

Dust Bowl

Sand dunes


• Glaciers– Large masses of moving ice

– Movement

changes the land

beneath themAlaska

Erosion & Deposition

• Deposition– the natural process of laying down

sediments in a new location

– creates new

landforms


• Deposition– deposited sediments are laid down in layers

– layers of sediment are

compacted under pressure

and eventually form

sedimentary rock layers


• Deposition– deposited sediments are laid down in layers– Layers of sediment are compacted

under pressure and eventually form

sedimentary rock layers.

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 layers.

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

preserved by the layers then mineral replacement 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.

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

DepositionTakes sediment to a new

location to build new rock layers

WeatheringBreaks down rock

Destructive Forces

Destructive Forces

Constructive Forces

Documents

Erosion & Deposition. Erosion and Deposition Weathering –the process by which natural forces break down rock and soil