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9 Cards in this Set
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cover 10% of earth |
85% of earths water is glacier water -still in ice age |
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what is a glacier
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simply an accumulation of snow and ice that is thick enough to flow downhill under its own weight |
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three types of glaciers |
-valley glaciers: long, narrow that are confined to valleys and flow downhill much like streams. small -ice sheets: cover entire landmasses two left on in greenland and Antarctica. largest. -ice caps: unconfined glaciers that are ambler than ice both ice sheets and ice caps may exhibit radial flow and have glaciers exiting them. |
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where do they form |
anywhere snow persist all year cold climate. high altitudes- where temp are colder than surrounding countryside. high latitudes- where seasons are colder. -heavy winter fall -snowline is where difference in color snow accumulative snow |
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snow metamorphism |
snow becomes ice it metamorphoses at temp and pressure on earths surface. -snowflakes turn into rounded ice grains due to weight accumulating over year. |
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glacial ice |
behaves like weak rock, has cleavage. upper reaches are brittle crevasses are cracks in in the ice. indicate flow paths of glaciers, restrict m |
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zone of accumulation |
where slot of snow forms zone ablation- less snow |
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glaciers move faster in the center, away from bottom and sides. -bottom of glacier controls temp and whether it slides or not sliding equals erosion. |
* -moraine: action of moving glacier depositional feature drumlin arete horn cirque: head of steep glaciers tarn |
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what changes ice ages determines the orbital of sun. the tilt more tilt more snow |
the milankovich cycles are where different orbits adjust spikes in temps determines are ice ages * know three different cycles for test |
