Erosion and Deposition

Breaking Down Processes

Weathering The breaking downbreaking down of the earth’s material

by natural processes. Erosion

The process by which weathered rock and soil particles are movedmoved from place to place.

Deposition The process by which weathered sediments

are laid downlaid down in a new location creating new landforms.

5 Agents of Erosion

Gravity Glaciers Wind Surface Water / Running Water Ocean Shoreline / Ocean Waves

Gravity PullsPulls rock and soil down a slope

Called Mass MovementMass Movement Rapid

Rockslides Mudflow Avalanche

GravitySlow

Slump Creep

Glaciers Carry very largelarge to very smallsmall

debris Most powerful agent Deposits

Form piles called morainesmoraines Drumlins – little mounds Glacial lakes Kettle lakes U-shaped valleys

Moraines

Drumlins

Glacial lakes

Kettle Lakes

U-shaped valleys

Glaciers

Glacial Erosion

Wind Removes looseloose material from the earth’s

surface. Amount of material carried depends on wind wind

speedspeed Most active in desertsdeserts, plowed fields, beaches

Deposits by wind Loess-Loess- layer of fine silt or sand Dunes-Dunes- mounds of sand

Loess

Dunes

Running Water MAJOR CAUSE OF EROSION

When water moves it carries particle called the loadload.

SpeedSpeed of water determines the size of the load Creates canyonscanyons and valleys

River deposits Delta OxbowOxbow lake Flood plains

River deltas

Oxbow Lakes

Flood Plains

Waves Constantly erode and shapeshape the

shoreline. Formation

Sea cliffs Sea stacksstacks and caves

Sea Stacks

Sea Stacks & cliffs

Cape Flattery, Olympic Peninsula

Sea caves

Waves

Deposits Beaches Spits sand barssand bars Barrier Islands

Barrier Islands

Spits & Sandbars

Erosion by Brainpop