Ch 17 vocab Word Scramble
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Term | Definition |
glacier | large mass of moving ice |
alpine glacier | narrow, wedge-shaped mass of ice that forms in a mountainous region and is confined to a small area by surrounding topography |
continental glacier | massive sheet of ice that may cover millions of square kilometers, may be thousands of meters thick, that isn't confined by surrounded topography |
basal slip | process that lubricates a glacier's base and causes the glacier to slide forward |
internal plastic flow | process by which glaciers flow slowly as grains of ice deform under pressure and slide over each other |
crevasse | in a glacier, a large crack or fissure that results from ice movement |
cirque | a deep and steep bowl-like depression produced by glacier erosion |
arĂȘte | a sharp, jagged ridge that forms between cirques |
horn | a sharp, pyramid-like peak that forms because of erosion of cirques |
erratic | a large rock that's transported from a distant source by a glacier |
glacial drift | rock material carried by glaciers and deposited by glaciers |
till | unsorted rock material that's deposited directly by a melting glacier |
moraine | landform that's made from unsorted sediments deposited by a glacier |
kettle | bowl-shaped depression in a glacial drift deposit |
esker | long, winding ridge of gravel and coarse sand deposited by glacial meltwater streams |
ice age | long period of climatic cooling during which continents are glaciated repeatedly |
Milankovitch theory | theory that cyclical changes in Earth's orbit and in tilt of Earth's axis occur over thousands of years and cause climatic changes |
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