Unit 43 Review Questions

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. Presently, continental glaciers exist in:

Antarctica and Greenland only correct incorrect

Antarctica, Greenland, and northern Canada correct incorrect

Antarctica, Greenland, northern Canada, and the Swiss Alps correct incorrect

Antarctica only correct incorrect

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. During the Late Cenozoic Ice Age:

the climate was warm enough that continental glaciers did not exist correct incorrect

ice sheets extended into the continental United States correct incorrect

the areas of present-day Arizona and Utah were buried under perpetual ice sheets correct incorrect

there were no significant interglacial periods correct incorrect

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. What happens as snow is converted into glacial ice?

It expands to form firn. correct incorrect

It decreases in density and its air pores increase in size. correct incorrect

It all converts to meltwater and then refreezes. correct incorrect

It is recrystallized and compressed. correct incorrect

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. When a glacier loses mass:

the zone of accumulation shifts uphill correct incorrect

the zone of ablation shifts downhill correct incorrect

its area increases as its thickness decreases correct incorrect

its thickness decreases and its terminus moves uphill correct incorrect

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. Most of the erosive work of glaciers is accomplished by:

deglaciation correct incorrect

glacial plasticity correct incorrect

glacial sliding correct incorrect

glacial creep correct incorrect

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. For mountain glaciers in warmer climates:

basal ice often melts and promotes erosion through glacial sliding correct incorrect

lower layers of the glacier are well below the freezing point, whereas upper levels are usually above the freezing point correct incorrect

the temperature profile of the glacier inhibits glacial sliding in favor of glacial creep correct incorrect

ice temperature remains uniform both across the surface of the glacier and down to the base of the glacier correct incorrect

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How is a roche moutonnée formed by a glacier?

By abrasion on both the "upstream" side of the glacier and the "downstream" side of the glacier correct incorrect

By plucking on both the "upstream" side of the glacier and the "downstream" side of the glacier correct incorrect

By abrasion on the "upstream" side of the glacier and plucking on the "downstream" side of the glacier correct incorrect

By plucking on the "upstream" side of the glacier and abrasion on the "downstream" side of the glacier correct incorrect