Lecture Outlines PowerPoint. Chapter 6 Earth Science 11e Tarbuck/Lutgens
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1 Lecture Outlines PowerPoint Chapter 6 Earth Science 11e Tarbuck/Lutgens 2006 Pearson Prentice Hall This work is protected by United States copyright laws and is provided solely for the use of instructors in teaching their courses and assessing student learning. Dissemination or sale of any part of this work (including on the World Wide Web) will destroy the integrity of the work and is not permitted. The work and materials from it should never be made available to students except by instructors using the accompanying text in their classes. All recipients of this work are expected to abide by these restrictions and to honor the intended pedagogical purposes and the needs of other instructors who rely on these materials.
2 Earth Science, 11e Glaciers, Deserts, and Wind Chapter 6
3 Glaciers: a part of two basic cycles in the Earth system Glaciers are a part of both the hydrologic cycle and rock cycle Glacier - a thick mass of ice that forms over land from the compaction and recrystallization of snow and shows evidence of past or present flow
4 Glaciers: a part of two basic cycles in the Earth system Types of glaciers Valley, or alpine glaciers form in mountainous areas Ice sheets, or continental glaciers Large scale e.g., Over Greenland and Antarctica Other types Ice caps and piedmont glaciers
5 Currently continental ice sheets cover Greenland and Antarctica Figure 6.1
6 Glaciers: a part of two basic cycles in the Earth system Movement of glacial ice Types of glacial movements Plastic flow Slipping along the ground Zone of fracture Uppermost 50 meters Crevasses form in brittle ice
7 Glaciers move by basal sliding and internal plastic flow
8 Glaciers: a part of two basic cycles in the Earth system Movement of glacial ice Zone of accumulation the area where a glacier forms Zone of wastage the area where there is a net loss due to melting
9 The glacial budget Figure 6.6
10 Glaciers: a part of two basic cycles in the Earth system Glaciers erode by Plucking lifting of rock blocks Abrasion Rock flour (pulverized rock) Striations (grooves in the bedrock)
11 Glaciers: a part of two basic cycles in the Earth system Landforms created by glacial erosion Glacial trough Hanging valley Cirque Arête Horn Fiord
12 Erosional landforms created by alpine glaciers Figure 6.9 C
13 The Matterhorn in the Swiss Alps
14 Glaciers: a part of two basic cycles in the Earth system Glacial deposits Glacial drift All sediments of glacial origin Types of glacial drift Till material that is deposited directly by ice Stratified drift - sediment deposited by meltwater
15 Glacial till is typically unstratified and unsorted Figure 6.13
16 Close-up view of the boulder in the previous slide
17 Glaciers: a part of two basic cycles in the Earth system Glacial deposits Depositional features Moraines layers or ridges of till Types of moraines Lateral Medial End Ground
18 Glaciers: a part of two basic cycles in the Earth system Glacial deposits Depositional features Outwash plain, or valley train Kettles Drumlins Eskers Kames
19 Glacial depositional features Figure 6.18
20 A drumlin in upstate New York
21 Kettle lakes
22 Glaciers: a part of two basic cycles in the Earth system Glaciers of the past Ice Age Began 2 to 3 million years ago Division of geological time is called the Pleistocene epoch Ice covered 30% of Earth's land area
23 Maximum extent of ice during the Ice Age Figure 6.19
24 Glaciers: a part of two basic cycles in the Earth system Glaciers of the past Indirect effects of Ice Age glaciers Migration of animals and plants Rebounding upward of the crust Worldwide change in sea level Climatic changes
25 Glaciers: a part of two basic cycles in the Earth system Causes of glaciation Successful theory must account for Cooling of Earth, as well as Short-term climatic changes Proposed possible causes Plate tectonics Continents were arranged differently Changes in oceanic circulation
26 Glaciers: a part of two basic cycles in the Earth system Causes of glaciation Proposed possible causes Variations in Earth's orbit Milankovitch hypothesis Shape (eccentricity) of Earth's orbit varies Angle of Earth's axis (obliquity) changes Axis wobbles (precession) Changes in climate over the past several hundred thousand years are closely associated with variations in Earth's orbit
27 Deserts Geologic processes in arid climates Weathering Not as effective as in humid regions Mechanical weathering forms unaltered rock and mineral fragments Some chemical weathering does occur Clay forms Thin soil forms
28 Deserts Geologic processes in arid climates Role of water in arid climates Streams are dry most of the time Desert streams are said to be ephemeral Flow only during periods of rainfall Different names are used for desert streams including wash, arroyo, wadi, donga, and nullah
29 Deserts Geologic processes in arid climates Role of water in arid climates Desert rainfall Rain often occurs as heavy showers Causes flash floods Poorly integrated drainage Most erosional work in a desert is done by running water
30 A dry stream channel in the desert Figure 6.26 A
31 The same stream channel following heavy rainfall Figure 6.26 B
32 Deserts Basin and Range: the evolution of a desert landscape Uplifted crustal blocks Interior drainage into basins produces Alluvial fans and bajadas Playas and playa lakes
33 Deserts Basin and Range: the evolution of a desert landscape Erosion of mountain mass causes local relief to continually diminish Eventually mountains are reduced to a few large bedrock knobs called inselbergs projecting above a sediment filled basin
34 Landscape evolution in a mountainous desert early stage Figure 6.27 A
35 Landscape evolution in a mountainous desert middle stage Figure 6.27 B
36 Landscape evolution in a mountainous desert late stage Figure 6.27 C
37 Inselbergs in southern California
38 Deserts Wind erosion Deflation Lifting of loose material Produces Blowouts Desert pavement Abrasion
39 Formation of a desert blowout
40 Formation of desert pavement Figure 6.32
41 Deserts Types of wind deposits Loess Deposits of windblown silt Extensive blanket deposits Primary sources are deserts and glacial stratified drift
42 Deserts Types of wind deposits Sand dunes Mounds and ridges of sand formed from the wind's bed load Characteristic features Slip face the leeward slope of the dune Cross beds sloping layers of sand in the dune
43 Formation of sand dunes Figure 6.35
44 Deserts Types of wind deposits Sand dunes Types of sand dunes Barchan dunes Transverse dunes Longitudinal dunes Parabolic dunes Star dunes
45 Sand dune types Figure 6.36
46 Sand dunes in the western United States
47 End of Chapter 6
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