Title: Glacial Erosion and Deposition Page: 82 Date: 3/5/2013

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Presentation transcript:

Title: Glacial Erosion and Deposition Page: 82 Date: 3/5/2013 Table of Contents Title: Glacial Erosion and Deposition Page: 82 Date: 3/5/2013

Objective Students will be able to identify features of glacial erosion and deposition.

Word of the Day There’s lots of ‘em.

Glacial Erosion As a glacier moves it breaks pieces of rocks of valley walls and floors in a process called Plucking. When a glacier flows over more rock, broken bits of rock in it act as sandpaper, scratching the bedrock. Striations: small scratches Grooves: large scratches Both will indicate the direction of movement.

Glacial Erosion Features of Glacial Erosion: Cirque: Scooped out depressions Arete: Sharp steep ridge between two cirques Horn: Steep pyramid shaped peak carved by three or more glaciers Hanging Valley: Form when a small glacier feeds a large glacier and they both melt Leaves behind waterfalls.

Cirque Arete

Hanging Valley Horn: Matterhorn in Switzerland Extremely famous!

Glacial Deposition Till: Unsorted rocks that glaciers pick up. Moraine: Unsorted ridge of till that is deposited when glacier melts. Terminal Moraine: Moraine at the end of a glacier. Lateral Moraine: Located parallel to the direction of glacial flow.

Terminal Moraines Lateral Moraine

Glacial Deposition Outwash: Sorted gravel, sand and silt that is deposited by meltwater. Outwash Plain: Area where outwash is deposited.

Glacial Outwash Glacial Outwash Plain

Glacial Deposition Drumlins, Eskers and Kames: Drumlin: Formed when continental glaciers flow over old moraines. The old moraines get shaped into straight ridges. Esker: Long ridges of sediments left behind by streams that flowed under glacier. Kame: Conical mound of sediment left behind when glaciers melt.

Drumlin Esker Kame

Glacial Lakes Kettles: When chunks of ice break off a glacier, they create depressions. When Ice melts those depressions fill with rain water creating a lake. Common in Massachusetts and New York. Walden Pond is a Kettle!

Kettle lakes Walden Pond

Glacial Lakes Cirques may also fill with water to form a lake. Moraine Dam: When a terminal moraine blocks off a valley, the valley will fill with water and create a lake. Example: The Great Lakes.

How come Great Lakes are not one Giant lake?