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The activities of humans may be contribu...View Answer
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A) They are being eroded by the flooding of old meltwater stream beds.
B) They are being mined for sand and gravel.
C) They are being leveled for housing developments.
D) They are being mined for valuable ore.
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A) their size.
B) their degree of confinement.
C) their rate of growth.
D) the rate at which their ice flows.
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A) wind erosion.
B) stream erosion.
C) erosion by glaciers.
D) mass- movement.
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A) Valley glaciers flow in preexisting stream valleys.
B) Piedmont glaciers begin as alpine glaciers but flow onto an adjacent lowland.
C) Continental ice sheets are confined glaciers that move over low- lying continental areas.
D) Cirque glaciers create and occupy semicircular basins on mountain sides.
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A) alpine regions.
B) equatorial regions.
C) desert regions.
D) polar regions.
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A) col.
B) arete.
C) hanging valley.
D) fjord.
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There were at least three ice ages durin...View Answer
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Eskers are long, sinuous ridges composed of glacial drift. They range in length between less than 1 kilometer and more than 150 kilometers, and can be 30 meters high. Eskers form beneath the zone of ablation of a glacier as meltwater flowing along a glacier's bed carves S- shaped bedrock channels and deposits sand and gravel in them.
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Albedo is the percentage of incoming solar radiation reflected from the surface of the Earth. When astronomical factors initiate a period of glaciation, the increased ice and snow reflect an increased higher percentage of incoming solar radiation back into space. Thus there is less available to warm the Earth's surface, the climate cools even further, and the cycle of increased global cooling continues.
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Until 65 million years ago, average glob...View Answer
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The budget of a glacier is the difference between the glacier's annual accumulation of snow and ice and its annual loss, or ablation, of snow and ice due to melting and sublimation. If accumulation is greater than ablation, the budget is positive, and the glacier will grow and its terminus will advance. If accumulation is less than ablation, the budget is negative, and the glacier will decrease in size and its terminus will recede. If accumulation and ablation are equal, the budget is balanced, and the size of the glacier and the location of its terminus will remain stationary.
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A) along the sides of a glacier.
B) where two valley glaciers merge.
C) beneath a glacier in a sinuous ridge.
D) where a glacier terminus advances beyond a recessional moraine.
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A) meltwater deposits of sand and gravel.
B) wind- blown deposits of outwash silt.
C) glacial advances over previously deposited moraines.
D) a mixture of sand and clay at the bottom of a meltwater lake.
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A) Drumlins are composed of unsorted, unstratified glacial drift.
B) Drumlins are oriented parallel to terminal moraines.
C) Drumlins are formed by continental ice sheets rather than by alpine glaciers.
D) Drumlins are elongated, asymmetrical hills.
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Four factors, beyond the initial snowfal...View Answer
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A) glacial deposits that are carried by meltwater into nearby streams.
B) glacial deposits of very fine particles that eventually become wind- blown.
C) all glacial deposits, collectively.
D) the redistribution of glacial deposits by consecutive advances.
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Many geologists have concluded that, for...View Answer
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A) In the accumulation zone, ice flows down toward the glacier's bed.
B) In basal sliding, a glacier slides along its bed on a film of water.
C) In extremely cold climates, glaciers flow more by basal sliding than by internal deformation.
D) In internal deformation, ice flows because crystals slide past one another under pressure.
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A) North America and Asia.
B) Asia and Australia.
C) Europe and North America.
D) Africa and South America.
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