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Glaciers Deposits Features True or False? Give me more! 100 100 100 100 100 200 200 200 200 200 300 300 300 300 300 400 400 400 400 400 500 500 500 500 500
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A glacier moves under this force
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Gravity
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A typical glacier moves more rapidly at this part
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base
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Glaciers move more rapidly when its warmer due to this process – give its name
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Basal slip
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Basal slip does not occur if the temperature is this
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Too cold below freezing
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In the middle of the glacier, the ice grains (firn) will move by slipping past one another through this process
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Plastic flow
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This is the general term for most unsorted and unstratified material left directly behind by a retreading glacier
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Till
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Tear or canoe shaped hill of unsorted/unstratified material left by a glacier
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Drumlin
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Drumlins direction of orientation is important for this reason
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Drumlins are orientated in the direction of ice flow – the wide side of tear/highest end is located toward direction that ice flowed from and slopes down toward direction of initial ice movement
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Rivers that form under the glacial ice can form this type of deposits
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Eskers
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Ice blocks that fall off of a retreating glacier may be covered by outwash, then be slow to melt, and eventually form a deep depression in the land that may or may not fill with water
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Kettle (kettle lake)
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Striations in bedrock provide an indication of glacier’s
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Direction of ice flow
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This is semi-circular feature is formed by an alpine glacier at the base/beginning of the glacier just below the moutain peak
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Cirque
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When two alpine cirques are found side by side, this steep high ridge feature is formed
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Arete
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In between two combining alpine glaciers, till may remain to form this feature
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Medial moraine
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Three features that are used to identify an esker
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1. Steep sloped 2. Synuous ridge (continues for a long distance) 3
1. Steep sloped 2. Synuous ridge (continues for a long distance) 3. Undulating (the elevation of the esker can flucuate)
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True or false - Rough granular ice material is called till
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False – rough granular ice material is called firn
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True or False: There is ice and rock material that is included into firn
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False – firn only includes granular ice material and no rock
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Valley glaciers have been found on every continent
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False – Australia has had not valley glaciation
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When a glacier melts back, then again moves not as far forward and stops for a period of time, a recessional moraine is formed
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True
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The theory of why the ice ages occurred in a cyclic pattern is called Milankovitch Theory
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True
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When three cirques are found on a mountain top, this very steep glacial peek may form
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Horn
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The 4 ice ages/advancements in the United States are named based on …
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The state that shows the most advance/most prominent of the glacial features
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The order of the ice ages in north america from oldest to youngest are
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Nebraskan, Kansan, Illilioian, Wisconsinan
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The furthest advance of a glacier will form this feature
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End moraine OR Terminal moraine
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On the far side of a terminal or recessional moraine, the meltwater will form a flat deposit of well sorted and stratified material called
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Outwash or outwash plain
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