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why glaciers are part of rock cycle
erosional agents that accumulate, transport, and deposit sediment
a glacier confined to a mountain valley, which in most instances had previously been a stream valley
a very large thick mass of glacial ice flowing outward in all directions from one or more accumulation centers
a glacier that forms when one or more valley glaciers emerge from the confining walls of mountain valleys and spread out to create a broad sheet in the lowlands at the base of the mountains
a type of glacial movement that occurs within the glacier below a depth of approximately 50 meters in which the ice is not fractured
zone of wastage
lies below the snowline there is a net loss to the glacier as all of the snow from the previous winter melts so does some of the glacial ice
the mechanical breakup of rock caused by the expansion of freezing water in cracks and crevices
the grinding and scraping of a rock surface by the friction and impact of rock particles carried by water, wind or ice
scratches or grooves in a bedrock surface caused by the grinding action of a glacier and its load of sediment
a tributary valley that enters a glacial trough at a considerable height above the floor of the trough
pater noster lakes
a chain of small lakes in a glacial trough that occupy basins created by glacial erosion
a pyramid-like peak formed by glacial action in three or more cirques surrounding a mountain summit
an asymmetrical knob of bedrock formed when glacial abrasion smoothes the gentle slope facing the advancing ice sheet and plucking steepens the opposite side as the ice overrides the knob
an isolated mountain remnant characteristic of the late stage of erosion in a mountainous region
an all-embracing term for sediments of glacial origin no matter how, where, or in what shape they were deposited
an ice-transported boulder that was not derived from the bedrock near its present site
a ridge of till along the sides of a valley glacier composed primarily of debris that fell to the glacier from the valley walls
a ridge of till formed when lateral moraines from two coalescing valley glaciers join
a relatively flat gently sloping plain consisting of materials deposited by melting-water streams in front of the margin of an ice sheet
a relatively narrow body of stratified drift deposited on a valley floor by melting-water streams that issue from the terminus of a valley glacier
depressions created when blocks of ice become lodged in glacial deposits and subsequently melt
sinuous ridge composed largely of sand gravel deposited by a stream flowing in a tunnel beneath a glacier near its terminus
a steep-sided hill composed of sand and gravel originating when sediment collected in openings in stagnant glacial ice
milankovitch's model for glaciation and the earth's orbit
1. variation in the shape of earth's orbit
2. changes in the angle of the axis
3. wobbling of the axis
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