Erosional Forces

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Erosion
Process that wears away surface materials and moves them from one place to another
Agents of Erosion
Wind, Water, Gravity, Glaciers
Deposition
Dropping of sediment when agents lose energy
Mass Movement
Erosion that moves materials downslope
Slump
Material slips down a curved surface because the bottom of the slope can no longer support the top
Creep
Occurs when material slowly shift position downhill
Rockfall
When rocks break free from a steep slope and tumble through the air, usually caused by ice wedging
Rock Slides
Occur when layers of rocks suddenly slips down a slope
Mudflows
Occur when areas of thick loose sediment mix becomes soaked with rain water and flows down a slope.
Glacier
Large mass of ice and snow moving on land under its own weight
Valley Glacier
Glacier found between mountain peaks that moves down the slope under its own weight
Continental Glacier
Glacier covering the polar region
Plucking
Dragging of rocks, sand and gravel below a glacier eroding the rock below
Gooves
Deep, long parallel scars in rock from a glacier dragging a rocks
Striations
Shallow marks in rock in the direction a glacier moves
Till
Mixture of different sized sediments left behind by a retreating glacier
Moraine
Ridge of till formed at the front of glacier
Outwash
Material deposited beyond the end of a glacier by meltwater
Eskers
Winding ridge deposit by a glacier formed when a river within the ice deposits sediments within its channel
Cirque
Bowl-shaped basin eroded by a valley glacier
Arete
Ridge formed by two valley glaciers
Horn
Sharpen peak created by a valley glacier
Deflation
Wind blows across loose sediment removing the smaller particles and leaving the heavier particles behind
Abrasion
Windblown sediment strikes and scrapes the surface of other rocks wearing down its surface
Loess
Wind deposited fine sediments
Dune
Mound of sediment drifted by the wind