Describe how glaciers erode rock and carry sediment
What will be an ideal response?
Shear stress increases with the increasing weight of the glacier, so a thick glacier exerts great shear stress on the bed and also on valley walls. This shear stress allows the moving ice to pluck rock and to abrade the rock because of fragments frozen into the ice. Water flowing beneath a glacier alternately freezes and thaws, which further dislodges rock fragments that may then freeze into the base of the glacier where they are carried along and may contribute to further rock abrasion. Water under the glacier commonly flows at high pressure, which enhances erosion potential and permits the water to carry eroded debris out from beneath the glacier.
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The Environmental Protection Agency's classification of fine and ultra-fine particles refers to ____________________
Fill in the blanks with correct word
Approximately how many years ago did our species, Homo sapiens, begin to migrate out of Africa and settle in Europe, Asia, and Australia?
A) 100 million years B) 100,000 years C) 1,000 years D) 1 million years E) 10,000 years
What landforms would you expect to see in the diagram after the glaciers melted completely away?
A. high, sharp peaks B. u-shaped valleys C. narrow, sharp ridges D. All of these choices are correct.
A parcel of air at the surface is heated which expands the air and increases the parcel's volume. If the same number of air molecules occupy the greater volume, density decreases. The increase in volume results in lower pressure. What will happen to the air surrounding this parcel?
A. Less dense air flows in to replace the rising air. B. Denser air flows in to replace the rising air. C. More dense air rises at the surface. D. Less dense air sinks at the surface.