Glaciers Copyright © Houghton Mifflin Company. All rights reserved.Essentials of Geology, 15a–1

Glaciers

Formation of Glacial Ice from Snow

Figure 15-5 Mechanics of Glacial Flow

Deeply Crevassed Davidson Glacier near Haines, Alaska

Source: Breck P. Kent

Crevasses

Video: Crevasses Essentials of Geology, 15a–6

Types of Glaciers (cont’d) –

Types of Glaciers (cont’d) – Angel Glacier

Source: Comstock

Types of Glaciers (cont’d) – Valley (Alpine) Glacier

Source: Tom Bean

Types of Glaciers (cont’d) – Icecap

Source: Betty Crowell/Faraway Places

Types of Glaciers (cont’d) – Tidewater Glacier

Source: Jim Wark/Peter Arnold, Inc.

Continental Glacier

Glacial Erosion

Deposition by Glaciers

• Till - a mixture (unsorted) of boulders, sand, clay and silt. Glaciers have filled entire valleys w/ till making them flat.

• Outwash - material deposited by the glacier as it melts, similar to river deposits. Outwash is sorted or separated by the size of its particles. (boulder, gravel, sand, silt)

lateral moraine

medial moraine

Till Erosion

• Moraine - mounds of materials deposited along the sides, in the middle or at the end of the glacier as it stops moving & begins to melt.

Till Erosion

• Erratic – Large boulders dropped by glaciers

Outwash

Large Sediment

Med Sediment

Small Sediment

http://www.classzone.com/books/earth_science/terc/content/visualizations/es1303/es1303page01.cfm?chapter_no=visualization

Glacier

melting

Depositional Features (continental glaciers)

How do Ice ages occur? Land bridge Formation

http://www.classzone.com/books/earth_science/terc/content/visualizations/es1506/es1506page01.cfm?chapter_no=visualization Essentials of Geology, 15c–32

Milankovitch Cycles

Milankovitch Cycles (cont'd)

Changes In Global Climate During the Cenozoic Era

Effects of North American Ice Sheet

Geology at a Glance The Work of Continental Glaciers

Geology at a Glance The Work of Alpine Glaciers

Glaciers Copyright © Houghton Mifflin Company. All rights reserved.Essentials of Geology, 15a–1

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