Exam 13: Glaciers and Glaciation

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The climatic event that began with cooling in about A.D. 1300 and lasted until the middle-1800s is known as the Little ____________________.

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Ice Age

How does the water bound in glaciers eventually reenter the hydrologic cycle?

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By calving and meltwater runoff.

Describe differences in flow rates within a valley glacier.

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Flow velocity is greater in the zone of accumulation than in the zone of wastage (or ablation), so velocity is greater higher up the glacier. Since the valley walls and floor cause frictional resistance, the ice in contact with the walls and floor moves more slowly than ice experiencing less friction. The uppermost part of the glacier does not move any slower or faster than the ice below it.

Glaciers are geologically important because they erode, transport, and deposit lot of material.

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Short-term climatic events, such as the Little Ice Age, may be caused by:

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What is glacial drift, and how does it differ from glacial till?

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Continental glaciers are presently found on:

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Sediment that is supplied to braided streams that are melting from continental glaciers forms an outwash plain.

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Under what conditions can glaciers exist in the equatorial latitudes?

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How can the boundary between the zones of accumulation and wastage on a glacier be located during the spring and summer?

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What are glaciers? How do they act as agents of erosion, transportation, and deposition?

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Is ice a mineral? Explain.

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How can you tell a river valley from a glacial valley if there is no glacier within the valley?

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A glacier begins to flow when the ice reaches a critical thickness of about:

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How does a terminal moraine differ from a recessional moraine?

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What is the lesser way that glaciers flow, and what facilitates this movement? In which type of glaciers is this flow more important?

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What does the term glaciation mean?

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The Little Ice Age ended in the mid- to late-1800s.

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What is a hanging valley, and how does one form?

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The terms valley glacier and mountain glacier are synonymous.

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