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Aim: How can glaciers erode and deposit on Earth’s surface?. Do Now: What is the driving force of glacial movement?. Glaciers: Erosion and Deposition:. Glacier :. A large mass of moving ice and snow. . Types of Glaciers: . Valley/Alpine G laciers:.

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Presentation Transcript
slide1

Aim: How can glaciers erode and deposit on Earth’s surface?

Do Now: What is the driving force of glacial movement?

slide2

Glaciers:

Erosion and Deposition:

Glacier:

A large mass of moving ice and snow.

slide4

Types of Glaciers:

Valley/Alpine Glaciers:

glaciers form in mountain valleys at high elevations.

Example locations:

Alps (Europe), Rockies (U.S.) Himalayas (India), Andes (Chile)

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Continental Glaciers:

form over vast area of land and radiate outward.

Example locations:

Greenland and Antarctica

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Ice Age Continental Glaciers:

  • In the geologic past, a much colder climate resulted in ice sheets covering much of Earth’s surface.
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There is evidence of at least 4 major ice ages during the last 2 million years.

The time period between ice ages is called interglacial periods.

The most recent ice age ended only about 11,000 years ago (Pleistocene)

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Glacial Erosion

  • Glaciers are the most powerful erosional agent because of their great size, weight, and density.
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Profile view of Valley Glacier

Plucking: removal of pre-existing rock

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Glacial Erosion Features

  • Striations/Grooves:

When glaciers with embedded rocks move over bedrock valley walls, they grind out parallel scratches into the bedrock.

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Cirque:

Bowl-shaped depression on side of mountain.

Arête:

Knife-like ridge where two cirques meet.

Horn:

Sharp peak after three cirques meet.