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Exam 12: Glaciers and Glaciation

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Question 21

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The down-valley part of a glacier is the ____, where melting, evaporation, and calving take place.

A) zone of accumulation
B) zone of replenishment
C) zone of ablation
D) recharge zone
E) discharge zone

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Question 22

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A(n) _____ -shaped valley (in cross section) is characteristic of glacial erosion.

A) S
B) U
C) V
D) Y
E) I

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Question 23

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The compacted mass of granular snow, transitional between snow and ice, is called firn.

The two types of glaciated terrain on the Earth's surface are alpine and valley.

Two layers of sediment resulting from one year's deposition in a glacial lake are called ___.

Where tributary glaciers come together the adjacent lateral moraines join to form a ______ moraine.

The central portion of a valley glacier moves _____ the sides.

A large trunk glacier carves a deeper valley than smaller tributaries. After the glacier disappears the tributary valley remains as _____ high above the main valley.

The boundary between the zone of accumulation and the zone of ablation is an irregular line called the _____.

A(n) ___________ is an ice-transported boulder that was not derived from the underlying bedrock.

A large trunk glacier erodes downward more rapidly and carves a deeper valley than do smaller tributary glaciers.

The thicker part of a glacier will flow slower than where it is thinner.

______ gives us more evidence of the beginning and ending times of glacial episodes than the direct study of glacial deposits.

During the most recent ice age, sea level was at least 100 meters lower than at present.

Sharp ridges called ___ separate adjacent glacially carved valleys.

Glaciers in temperate climates may have crevasses that extend to their base.

Unsorted and unlayered rock debris carried or deposited by glaciers is called till.

A worldwide decrease of at least _____ $\degree$ C in temperature would bring about a new glacial age.

A glacier will flow faster where it is steeper and _____.

Bodies of till shaped into streamlined hills are called drumlins.