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28 Cards in this Set
- Front
- Back
Compared with the amount of ice that existed during the last glacial maximum, how much exists today? |
1/3 as much |
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You are working in a field area that you think at one time contained valley glaciers. What evidence would you look for to determine this? |
You would look for rounded, U-shaped valleys. |
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During the last glacial maximum, the position of sea level occurred at what elevation relative to its position today? |
At the last glacial maximum, sea level was about 100 meters (~300 feet) lower than it is today. |
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Which part of a glacier will see the build-up of ice and snow over the course of a full year? |
Zone of accumulation |
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How does a glacier lose ice through sublimation? |
Ice changes from solid to gas. |
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What scenario describes a glacial advance? |
More ice and snow accumulates than melts each year. |
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During a glacial retreat, a glacier will flow _____ while the terminus moves _____. |
forward; backward |
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Which type of glacial movement is circled
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basal sliding |
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Which type of glacial movement will be responsible for the greatest amount of glacial flow? |
Internal Flow |
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Explain why post A has moved farther than posts B and C
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Ice in the center of a glacier has the least friction with the surrounding bedrock and can flow faster. |
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A __________ is defined as a chain of glacial lakes where each lake flows into the next. |
pater noster lake |
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What glacial feature is circled in Figure 1?
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arête (This arête formed between two U-shaped glacial valleys) |
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What glacial feature is circled in Figure 2?
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horn (Horns are peaks that have been eroded on all sides by glaciers) |
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What is the best way to describe the shape of a glacial valley? |
U-shaped (U-shaped glacial valleys are very characteristic on an alpine landscape) |
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Which two regions currently contain the world’s last remaining ice sheets? |
Antarctica and Greenland |
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When was the last time North America had major ice sheets |
18,000 years ago |
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Which landform marks the furthest extent of an advancing glacier? |
terminal moraine |
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What glacial landform is visible in Figure 1?
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dumlin |
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What feature is responsible for creating eskers? |
streams that flowed below, in, or on the glacier |
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Which orbital effect describes how the shape of Earth’s orbit around the Sun will change over time? |
Which orbital effect describes how the shape of Earth’s orbit around the Sun will change over time? |
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What is the critical latitude for incoming solar radiation, which could affect the formation of ice sheets? |
65° N |
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What effect will an increased angle of tilt have on the Earth’s climate? |
warmer summers and colder winters |
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Which of the following scenarios will have the greatest chance of triggering an ice age? |
eccentricity, obliquity, and precession overlapping to provide the least amount of solar radiation |
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________ are stratified sands and gravels carried away from the glacial terminus by meltwater. |
outwash |
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What is a pluvial lake? |
A lake that fills due to increased precipitation in a cooler, wetter climate |
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Which part of a glacier is responsible for abrasion and plucking? |
Basal Sliding Zone |
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________ is the name for glacial deposits that have been lithified into a sedimentary rock. |
Tillite |
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Which glacial erosion feature will likely contain a waterfall today? |
Hanging valley |