9 Erosion by WindWind causes erosion by deflation and abrasion.
10 Deflation The erosion of sediment by wind. Stronger the wind, the larger the particles it can pick up.
11 Deposits By Wind Sand Dunes Deposit of wind-blown sand. Loess Wind-formed deposit made of fine particles of clay and silt.
12 GlacierAny large mass of ice that moves slowly over land.
13 PluckingThe process by which a glacier picks up rocks as it flows over the land.
14 TillA mass of rock and soil deposited directly by a glacier.
15 Two Kinds of GlaciersContinental GlacierValley Glacier
16 Continental GlacierA glacier that covers much of a continent or large island.Can cover millions of square kilometers.Antarctica and Greenland.Can flow in all directions.Can spread out like pancake butter in a frying pan.
17 Ice AgesIn the past, continental glaciers have covered larger parts of the Earth’s surface.
18 Valley GlaciersA long, narrow glacier that forms when snow and ice build up high in a mountain valley.The sides of mountains keep these glaciers from spreading out in all directions.Found in many high mountains.Sierra Nevada and Mount Shasta.
19 GlaciersGlaciers can form only in an area where more snow falls than melts.Once the depth of snow and ice reaches more than 30 to 40 meters, gravity begins to pull the glacier downhill.
20 How Glaciers Shape the Land PluckingPicks up rocks as it movesCarries rocks with it as it movesAbrasionGouges and scratches the bedrockAllows for rock to be picked up by plucking
22 Glacial DepositionWhen a glacier melts, it deposits the sediment it eroded from the land, creating various landforms.
23 Glacial Deposition Landforms TillMixture of sediments that a glacier deposited on the surface.MoraineTill that is deposited at the edges of a glacier forms a ridge.Kettle LakeForms when a depression left in a till by melting ice fills with water.