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26 Cards in this Set
- Front
- Back
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approximately what percentage of the world's freshwater is frozen? |
77 % |
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the bulk of ice on earth is sitting in |
greenland and antartica |
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a general term for a mass of perennial ice, resting on land or floating shelf-like in the sea adjacent to land is |
a glacier |
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truth about the snowline |
it decreases in elevation with increasing latitude |
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a glacier that is confined in a bowl-shaped recess is called a |
cirque glacier |
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a continuous mass of ice covering a large landmass is known as a |
continental glacier |
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the process of calving produces |
icebergs |
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melting and refreezing of snow acts to _____ ice density and _____ the sphericity (roundness) of the original snowflakes |
increase; increase |
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why, specifically, is glacial ice analogous to a metamorphic rock |
it forms as a result of recrystalization caused by pressure |
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the transformation of snow into glacial ice in Antarctica takes _______ than in midlatitude alpine glaciers because______. |
1. longer; less snow falls per year in polar regions 2. longer; less melting and refreezing in antartica |
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the opposite of the accumulation zone in a glacial mass balance is called |
ablation zone |
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the zone where positive gains end losses begin in the glacial mass balance is called |
an equilibrium line |
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which of the following are erosional landforms created by alpine glaciation |
cols and horns |
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which of the following is a continental depositional feature? |
drumlin |
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unlike a stream-cut valley that assumes a characteristic _______-shape, a glacially-carved valley evidences a characteric ______-shape |
V;U |
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a specific landform produced by the deposition of glacial till is known as |
a moraine |
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a pyramidal peak formed in glaciated mountains is |
a horn |
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drowned glacial valleys are known as |
fjords |
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a winding hill of sorted sand and gravel deposits is known as a/an _______ and is deposited by a/an ________ glacier |
esker; continental |
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Louis Agassiz called glacially deposited boulders that differ in composition and origin from the ground on which they rest |
arretics |
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thoreau walden pond is an example of |
kettle |
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flowing soil in an area of frozen ground is known as |
gelifluction, in general solifluction |
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Permafrost |
it develops where soil or rock temperatures are below freezing for at least two years |
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glaciation takes about _______ years to develop, where as an deglaciation requires about _______ years. |
90,000;10,000 |
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viking colonies in Iceland apparently were deserted because of a |
drop in temp that occurred during the "Little ice age" and the decline in food production |
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it is now virtually certain that the dominant cause of recent ice ages is |
variations in Earth-sun orbital relationships |
