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Exam 17: Glaciers and Glaciation

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Question 61

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By what other process other than plastic flow or basal slip can a glacier move over its bed?

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by deforming underly...

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Question 62

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________ are erosional features produced by valley/alpine glaciers.

A) Moraines
B) Cirques
C) Eskers
D) Drumlins

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Question 63

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In broad lowlands below steep glaciated mountains (e.g.Ellesmere Island today), valley glaciers coalesce to form ________.

A ________ is an erosional feature specifically produced by alpine glaciation.

An esker is made of ________.

Abrasion and plucking generally involve what part of a glacier?

The most spectacular glacial landforms are caused by vast continental ice sheets.

The wobbling motion of a spinning object is known as ________.

The steep, triangular shaped cliffs that flank hanging valleys are called ________.

A ________ forms when stagnant, glacial ice melts after being buried by till or outwash.

The abrupt break in stream gradients in glaciated terrains often leads to spectacular mountain waterfalls such as at Trout Pond Newfoundland and Helmcken Falls in Wells Gray Park, B.C.These are all examples of what kind of glacial valley intersection?

How much of Earths land surface is currently covered by glacial ice?

The Pleistocene Epoch began about 6 million years ago.

Which one of the following prominent features were significantly larger than at present day during the Pleistocene glacial episodes?

Boulders that are lithologically different than the local bedrock (like a loose Precambrian gneiss found sitting on top of bedded Paleozoic limestones) are called ________.

Ice masses that entirely cover uplands and plateaus such as the islands in Nunavut or Vatnajukull in Iceland are called ________.

Glaciation is episodic because it has occurred at various times in Earth history since the Precambrian, but periodic in detail because of the alternating glacial and interglacial stages as seen in the Pleistocene.

When did the great southern hemisphere glaciation of Pangaea occur?

A ________ is a glacier-cut valley that was partly flooded as sea level rose.

A cirque is made of ________.