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28 Cards in this Set
- Front
- Back
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Glacier |
natural body of ice, originating on land, and undergoing movement that transports ice and rock from an area of accumulation to an area of disposal |
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Valley (alpine) glacier |
mountainous areas flows down valley from accumulation center at its head |
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ice sheet |
larger scale greenland antarctica |
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morraine |
ridge like pile of till |
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drumlins |
low smoothly rounded elongated hill of till |
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outwash plains and valley trains |
broad gently sloping sheet of outwash |
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kames |
mound, knob, or ridge of stratified material |
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eskers |
serpentine ridge of material |
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u-shaped valley |
valley carved by glacial ice |
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arete |
knife ridged edge |
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cirque |
bowl shaped feature on the side of a mountain |
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hanging valley |
glacial carved valley above another |
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horn |
triangular peak created by two or more cirques |
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ice age |
began 2 million and 3 million years ago most glacial stages took place during pleistocene epoch |
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quarternary glaciations |
2.58 mya to present cenazoic |
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karoo glaciation |
360-260 mya late paleozoic |
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andean-saharan glaciation |
450-420 mya early middle paleozoic |
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cryogenian glaciation |
800-635 mya late precambrian |
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huronian glaciation |
2400-2100 mya mid precambrian |
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wisconsonian |
85-11 kya quaternary |
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illinoian |
191-130 kya quaternary |
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pre-illinoian |
250-0.5 mya quaternary |
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indirect effects of ice age |
forced migration of animals and plants changed stream courses rebounding upward of the crust in former centers of accumulation change in sea level climate changes
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pinedale |
30,000 yr BP- 15,000 yr BP |
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bull-lake |
200,000 yr BP to 130,000 yr BP |
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pre bull-lake |
700,000 yr BP to 300,000 yr BP |
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causes of glaciation |
plate tectonics variations in earths orbit |
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milankovich hypothesis |
shape of earths orbit varies angle of earths axis changes changes of climate over years associated with variations in geometry of earths orbit |
