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Exam 14: Snow Into Ice--The Basis of Glaciers

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Question 21

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A glacierʹs mass balance is determined by

A) ablation.
B) accumulation.
C) both accumulation and ablation.
D) neither accumulation nor ablation.

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Question 22

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Materials transported directly by glaciers tend to be unsorted when deposited,but those carried by meltwater are sorted.

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Question 23

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Partly compacted snow that is intermediate between snow and ice is called a(n)

A small hill,knob,or mound of sorted sand and gravel that forms on the surface of a glacier and is deposited after the glacier retreats is a(n)

A lake that fills a steep-sided depression that is left in ground moraine by a large block of stranded ice that melts is called a(n)

Overall,the Arctic is much cooler than Antarctic.

Firn has a higher density than glacial ice.

The Arctic region is defined based on the July 10°C (50°F)isotherm whereas the Antarctic region is defined based on the February 10°C (50°F)isotherm.

The Great Lakes of the United States resulted from repeated glacial advances and retreats which enlarged and deepened stream valleys to form the basins of the future lakes.

The origins of glacial landforms are difficult to ascertain because glaciers produce landforms that are similar to landforms made by fluvial processes.

Which of the following has NOT been cited as a possible cause of ice sheet darkening?

About half of Arctic sea-ice volume has disappeared since 1970 due to warming throughout the region.

When several cirque glaciers gouge an individual mountain summit from all sides,a pyramidal peak known as a_________ results.

If two glaciers with lengthy ridges of till along each side of the glacier merge,a _________moraine may form.

Cirques,horns,cols,and arête are example of depositional landforms from ice sheets.

Which of the following is NOT an erosional feature formed by an alpine glacier?

Till that forms behind a terminal moraine as the glacier retreats and is generally spread widely across the ground surface is called a(n)

Permafrost requires soil,sediment,or rock temperatures to remain below freezing for at least 2 years.

The ice sheets of Greenland and Antarctica have an average thickness of about 2 km (1.24 mi).

Eroded debris dropped at the glacierʹs farthest extent is called _________moraine.