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

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Presentation transcript:

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

Copyright © Houghton Mifflin Company. All rights reserved.Essentials of Geology, 15a–2 Formation of Glacial Ice from Snow

Copyright © Houghton Mifflin Company. All rights reserved.Essentials of Geology, 15a–4 Figure 15-5 Mechanics of Glacial Flow

Copyright © Houghton Mifflin Company. All rights reserved.Essentials of Geology, 15a–5 Deeply Crevassed Davidson Glacier near Haines, Alaska Source: Breck P. Kent

Crevasses Video: CrevassesEssentials of Geology, 15a–6

Copyright © Houghton Mifflin Company. All rights reserved.Essentials of Geology, 15a–7 Types of Glaciers (cont’d) –

Copyright © Houghton Mifflin Company. All rights reserved.Essentials of Geology, 15a–8 Types of Glaciers (cont’d) – Angel Glacier Source: Comstock

Copyright © Houghton Mifflin Company. All rights reserved.Essentials of Geology, 15a–9 Types of Glaciers (cont’d) – Valley (Alpine) Glacier Source: Tom Bean

Copyright © Houghton Mifflin Company. All rights reserved.Essentials of Geology, 15a–10 Types of Glaciers (cont’d) – Icecap Source: Betty Crowell/Faraway Places

Copyright © Houghton Mifflin Company. All rights reserved.Essentials of Geology, 15a–11 Types of Glaciers (cont’d) – Tidewater Glacier Source: Jim Wark/Peter Arnold, Inc.

Continental Glacier Copyright © Houghton Mifflin Company. All rights reserved.Essentials of Geology, 15a–12

Copyright © Houghton Mifflin Company. All rights reserved.Essentials of Geology, 15a–13 Glacial Erosion

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

Copyright © Houghton Mifflin Company. All rights reserved.Essentials of Geology, 15a–16

Copyright © Houghton Mifflin Company. All rights reserved.Essentials of Geology, 15a–18

Copyright © Houghton Mifflin Company. All rights reserved.Essentials of Geology, 15a–19

Copyright © Houghton Mifflin Company. All rights reserved.Essentials of Geology, 15a–20

Copyright © Houghton Mifflin Company. All rights reserved.Essentials of Geology, 15a–21

Copyright © Houghton Mifflin Company. All rights reserved.Essentials of Geology, 15a–22

Copyright © Houghton Mifflin Company. All rights reserved.Essentials of Geology, 15a–23

Copyright © Houghton Mifflin Company. All rights reserved.Essentials of Geology, 15a–24

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 ge01.cfm?chapter_no=visualization Glacier melting

Depositional Features (continental glaciers)

Copyright © Houghton Mifflin Company. All rights reserved.Essentials of Geology, 15c–31 How do Ice ages occur? Land bridge Formation

s/es1506/es1506page01.cfm?chapter_no=visualizationEssentials of Geology, 15c–32 Milankovitch Cycles

Copyright © Houghton Mifflin Company. All rights reserved.Essentials of Geology, 15c–33 Milankovitch Cycles (cont'd)

Copyright © Houghton Mifflin Company. All rights reserved.Essentials of Geology, 15c–34 Milankovitch Cycles (cont'd)

Copyright © Houghton Mifflin Company. All rights reserved.Essentials of Geology, 15c–35 Milankovitch Cycles (cont'd)

Copyright © Houghton Mifflin Company. All rights reserved.Essentials of Geology, 15c–36 Changes In Global Climate During the Cenozoic Era

Copyright © Houghton Mifflin Company. All rights reserved.Essentials of Geology, 15c–37 Effects of North American Ice Sheet

Copyright © Houghton Mifflin Company. All rights reserved.Essentials of Geology, 15c–38 Geology at a Glance The Work of Continental Glaciers

Copyright © Houghton Mifflin Company. All rights reserved.Essentials of Geology, 15c–39 Geology at a Glance The Work of Alpine Glaciers