Glaciers and Glaciation (Test 3) – Flashcards
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Where is the world's second-largest continental ice sheet?
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Greenland
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Where is the world's largest ice sheet currently located?
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Antarctica
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Approximately how long ago did the last of the great North American ice sheets melt?
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15,000 years ago
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What term refers to the nearly vertical cliff left alongside a U-shaped valley where a tributary glacier entered at a high position on the valley wall?
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Hanging valley
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What erosional features are produced at the heads of valley/alpine glaciers?
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Cirques
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What depositional feature would logically be situated next to a large end moraine or a terminal moraine?
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Outwash plain
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What is the typical cross-valley profile of canyons and valleys eroded and depended by alpine or valley glaciers?
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U-shaped
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Which process occurs when a glacier enters the sea?
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Calving
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What is one of the two major flow mechanisms in a glacier?
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Basal slip
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Which feature represents a former meltwater channel or tunnel in glacial ice that was filled with sand and gravel?
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Esker
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Which of the following does not contribute to the formation of glaciers?
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Comets
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Which of the following is an erosional feature specifically produced by alpine glaciation?
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U-shaped valley
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Which of the choices below is an irregular, usually thin layer laid down by a retreating glacier?
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Ground moraine
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Which of the following is often associated with a cirque basin in high, mountainous terrain?
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Tarn lake
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What type of moraine is formed by the merging of two lateral moraines at a junction of two valley glaciers?
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Medial
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What epoch of the geological time scale represents the time of the most recent Ice Age?
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Pleistocene epoch
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Which one of the following features forms when stagnant, glacial ice melts after being buried by drift?
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Kettle
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Abrasion and plucking generally involve what part of a glacier?
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The basal, sliding zone
