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20 terms

Chapter 13: 20 questions

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glacier
A/An ____________________ is a massive, long-lasting accumulation of compacted snow and ice that forms on land.
terminus
The place where glacial flow cannot keep pace with melting is called the ____________________.
Till
____________________ is sediment that was deposited directly by a glacier.
horn
The Matterhorn is an example of a glacial ____________________.
Pleistocene
The most recent ice age occurred during the ____________________ Epoch.
alpine
A glacier that forms in mountainous terrain is a/an ____ glacier.
99%
The ice sheets of Greenland and Antarctica contain ____ percent of the world's ice.
10 to 100 meters
A glacier can move as fast as ____ per day.
zone of ablation
The lower elevation portion of a glacier where less snow is added in winter than melts in summer is called the ____.
terminus
The lower end of a glacier is called the ____.
U
Glaciers erode ____-shaped valleys.
Stratified drift
____ is sediment that was first transported by a glacier and then transported and deposited by a stream.
snow survives through one summer.
Rounded ice grains, called firn, form if:
near mountain tops (at high elevations) on all continents.
Alpine glaciers occur:
in polar regions.
Continental glaciers occur:
fjords.
Valleys that have been carved by glaciers and have became submerged by rising sea level are called:
hanging valley.
A smaller glacial valley that meets the main valley with a large vertical offset is called a:
the Earth's orbital parameters (eccentricity, tilt, precession).
Cycles identified by Milutin Milankovitch are caused by changes in:
dropped by about 130 m
During the last glaciation, sea level:
True
Glaciers are now shrinking in more places and at more rapid rates than at any time since scientists began keeping records.