Geology 101 Glaciers and Ice Age
Geology 101 Glaciers and Ice Age 101-017
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This 2 page Class Notes was uploaded by Natalee Stanton on Tuesday March 29, 2016. The Class Notes belongs to 101-017 at University of South Carolina taught by in Winter 2016. Since its upload, it has received 13 views. For similar materials see Geology 101-017 in Geology at University of South Carolina.
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Date Created: 03/29/16
GEOL 101: Glaciers and Ice Ages I. Milankovitch cycle Orbital variations of the Earth Effect the incidence of solar radiation o Eccentricity o Tilt o Precession II. Glaciers Glacier – moving body of ice that forms form accumulation and compaction of snow o 10% of earth’s land surface is covered by glaciers o Most effective agents of erosion Two Glacier Types 1. Valley (alpine) – form in the cold heights of the mountains, where snow accumulates usually in preexisting valleys, and they flow down the bedrock valley 2. Continual – extremely slow moving, thick sheets of ice that cover How glaciers form o Low temps – to keep snow on the ground yearround High altitudes High latitudes o Large amounts of show Snow – granular ice – firm (practically melted snow flakes) Ablation – total amount of ice that a glacier losses each year o These great ice burgs Sublimation – solid becomes a gas (doesn’t go into a liquid) III. Evidence of erosion Striation – are grooves created by rocks scratching against bedrock at the base of a glacier o Are evidence of the direction of ice movement U shaped valleys Heads of a glacial valleys Moraines accumulation of rocky, sand, and clayey material carried and deposited by ice Sample Exam Questions Which of the following do we think had most significantly changed the carbon cycle over the past 150 years? a. Burial of organic carbon b. Burning of fossil fuels c. Deposition of carbon – rich sediments d. Volcanism How much of the land surface is covered by ice? a. Approximately 10% b. Approximately 50% c. Approximately 30% d. Approximately 80% Which of the following would cause sea level to rise a. Melting of a very large iceberg b. Melting of the Ross ice shelf c. Melting of the Greenland ice cap d. All of the above Which of the following is an extremely slowmoving sheet of ice that covers vast land areas? a. An arête b. A continental glacier c. An ice shelf d. A valley glacier
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