GLACIER QUIZ
(http://www.uwgb.edu/dutchs/Exams/202EXAMS/glacial.htm)
- What causes ice ages?
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variations in the earth's orbit
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variations in sun's heat output
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variations in sunlight reflected by the earth
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no definite cause has been conclusively proven
- Ice near the surface of a glacier exhibits ________behavior.
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brittle
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ductile
- Ice deep within a glacier exhibits________behavior.
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brittle
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ductile
- Which of the following was never an outlet of the Great Lakes during the
retreat of the glaciers?
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the Gulf via the Mississippi
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to the Atlantic via the Potomac or Susquehanna
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from Lake Erie to the Ohio River
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across Ontario to the St. Lawrence
- The end of a glacier is located:
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where it meets an obstacle
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where the average annual temperature equals 32 degrees F.
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where snowfall plus inflow equals melting plus evaporation
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where one year's snow just melts before the next year's snow begins
- Most of the world's glacial ice is in:
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mountain glaciers
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the Antarctic Ice Cap
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the Greenland Ice Cap
- The Wisconsin, Illinoisan, Kansan and Nebraskan ice advances:
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account for all known Pleistocene ice advances
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account for almost all Pleistocene ice advances
-
are only the last of many more Pleistocene ice advances
- The "firn line" on a glacier marks:
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the dividing line between the zones of accumulation and ablation
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the elevation above which snow never melts
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the elevation where the average annual temperature is below freezing
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the timber line, or elevation above which trees do not grow
- Why do continental glaciers have a dome-like profile?
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More snow falls in the interior of the glacier.
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Ice melts faster at the edges than the middle.
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Ice has lower density than rock, so the crust rises under the glacier.
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the ice flows outward under its own weight.
- Glaciers can only exist where the average temperature is below freezing.
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true
-
false
- When a glacier retreats, a rock trapped within the ice
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continues to move toward the foot of the glacier
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retreats more slowly than the glacier front
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retreats as fast as the glacier front
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retreats faster than the glacial front
- Icebergs are formed by:
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freezing of sea water
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river ice which is carried out to sea
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pieces of glacial ice breaking off the glacier
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water freezing on the sea floor and floating to the surface
- During the Pleistocene, large lakes covered parts of the Western U.S.
These lakes are known as:
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crater lakes
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playas
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pluvial lakes
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flood plains
- The Pleistocene ice advances:
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are known to have ended
-
are the only ones known in geologic history
-
both of the above
-
neither of the above
- The result of a glacier flowing into the sea:
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icebergs
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ice shelves
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both of the above
-
neither of the above
- A glacier flows down a deep, slightly winding valley. After the glacier
melts, the valley will be all of these except:
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straighter
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deeper
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wider
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more winding
- Hanging valleys:
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form when a glacier in a major valley cuts deeper than the tributary glacier
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are common locations for waterfalls
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are among the few cases of tributary valleys that do not meet the main
valley at the level of the valley floor
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all of the above
- How is it possible for a stream to have flowed on top of an esker?
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the original stream banks are now eroded away
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there used to be a stream channel on top which has been filled in
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the "banks" of the stream were glacial ice
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it really isn't possible
- Which of these is till?
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fine flacial lake clay
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well-sorted outwash sand
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a polished rock outcrop
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unsorted sand, gravel and clay in a moraine
- Depending on pressure, glacial ice exhibits two forms of behavior:
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brittle and ductile
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solid and granular
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plastic and liquid
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snow and hail
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Glaciers
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