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15 Cards in this Set
- Front
- Back
Ice age
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A period if time when much of Earth's land is covered in glaciers. Sheets of ice that were thousands of meters thick shaped places like the Alps, Cape Cod, nad Yosemite Valley
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Glacier
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A thick ice mass that forms over hundreds or thousands of years. Today it still overs nearly 10 percent of Earth's land area
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Snowline
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The lowest elevation in a particular area that remains covered in snow all year. At the poles it occurs at sea level.
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Valley glacier
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Ice masses that slowly advance down valley that were orginally occupied by streams. It also flows between steep rock walls from a place near the top of the mountain valley
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Ice sheet
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Enormous ice masses that flow in and directions form one or more centers and cover everything but the highest land
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Glacial trough
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The once narrow V-Shaped valley is changed into a v-Shaped glacial trough
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Till
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Material deposited directly by the glaciers. It's deposited as the glacier melts and drops its load of rock debris.
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Stratified drift
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Sediment laid down by glacial meltwater. It contains particles that are sorted according to size and weight of the debris often consits of sand and gravel, because the meltwater cannot move large boulder sand finer sediments remain suspended and are carried far from the glacier.
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Moraine
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When glaciers melt, they leave layers of ridges of till. These widespread glacial features come in several varieties
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Alluvial fan
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Fan-shaped deposit of sediment formed when a stream's slope is abruptly reduced
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Playa lake
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A flat area on the floor of an undrainage desert basin that fills and becomes a lake after heavy rain
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Delation
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The lifting and removal of loose particles such as clay and silt
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Desert pavement
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A layer of coarse pebbles and gravel created when wind removed the finer material
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Loess
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Wind blown silt that blankets the landscape
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Dune
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Unlike deposits of loess, which form blanket-like layers over broad areas, winds commonly deposit sand in mounds or ridges
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