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30 Cards in this Set
- Front
- Back
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What are two types of glacial flow
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Plastic flow, basal slip
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What is a think ice mass that form above what over hundreds or thousands of years.
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glacier above the snowline
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What are four factors if the Ice Age
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began 2 to 3 million years ago, division of geological time is the pleistocent, ice covered 30% of Earth's land, and area greatly effected drainagepock.
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Deposits of windblown silt are called what
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loess
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Six types of sand dunes
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Barchan, transverse, barchanoid, longitudinal, parabotic, and star
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The lifting and removal of loose particles such as clay and silt is called
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deflation
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Winds commonly deposit sand in mounds or ridges are called what
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dunes
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Enormous ice masses that flow in all directions from one or more centers and cover everything but the highest land
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ice sheet
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what is the budget of a glacier
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The balance or lack of balance between accumulation at the upper end of a glacier and loss, or wastage, at the lower end
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What was a period of time when much of the Earth was covered in glaciers
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Ice Age
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Is a U-shaped valley that was one a V-shaped but was deepend by a glacier
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glacial trough
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A bowl-shaped depression at the head of a glacial valley
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cirque
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Two types of glacial drift
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till, stratified drift
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till
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Material deposited directly by the glacier
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Stratified drift
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sediment laid down by glacial meltwater
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Streamlined, asymmetrical hills composed by glacial dirt
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drumlins
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Layers of ridges of till are called what
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moraines
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A fan-shaped deposit of sediment formed when a stream's slope is abruptly reduced is what
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alluvial fan
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A layer of coarse pebbles and gravel created when wind removed the finer material is called what
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desert pavement
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Name two land masses that ice sheets currently cover
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greenland and Antarctica
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How do glaciers erode
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plucking and abrasion
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what are four erosinal features that glaciers are responsible for
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glacial troughs, horns, cirques, and hardness of the rock fradgments at the base of the glacier
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What are depressions created when a block of ice becomes lodged in glacial deposits and subsequently melts
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kettles
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What are ridges composed largely of sand and gravel deposited by a stream flowing beneath a glacier near its terminus
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eskers
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Applies to all sediments of glacial orgin, no matter how, where, or in what form they were deposited
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glacial drift
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A flat area on the floor of an undrained desert basin that fills and becomes a lake after heavy rain
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playa lake
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A common dune form that is intermediate between a barchan and transverse dune is the what dune
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barchanoid
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Solitary sand dunes shaped like crescents are called
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barchan dunes
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Dunes are often what on the sheltered side and gently sloping inclined on the side facing the wind
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steeper
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the drift that is sediment laid down by glacial meltwater
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Stratified
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