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Points Earned:1/1 Correct Answer:C Your Response:C Regions with mountain glaciers that experience much surface melting in the summer typically are eroded: 3.At the same rate that natural rainfall dissolves granite. A.At a slower rate than regions with streams but no glaciers. B.At the same rate as regions with streams but no glaciers. C.At a faster rate than regions with streams but no glaciers. D.Not at all; no erosion occurs in typical regions with melting glaciers. E.Yosemite Valley, Glacier National Park and other glaciated regions still bear the unmistakable marks of glaciers despite more than 10,000 years of modification by streams. Glaciers experiencing melting change the landscape faster than streams do. Points Earned:1/1 Correct Answer:D
Your Response:D The things that glaciers deposit include: 4.Till (which is unsorted) and outwash (which is sorted). A.Striations and polish. B.Cirques and hanging valleys. C.Bedrock knobs that are rough on the upglacier side and rounded on the downglacier side. D.Till (which is sorted) and outwash (which is unsorted). E.Striations, polish, cirques, hanging valleys, and rough-downglacier/rounded-upglacier (not vice versa) bedrock knobs are all features of glacier erosion, not deposition. Till, deposited directly from the ice, includes pieces of all different sizes because ice can carry all sizes without sorting by size; outwash is washed out of a glacier by meltwater and sorted by size. Points Earned:1/1 Correct Answer:A Your Response:A Evidence that glaciers were much bigger about 20,000 years ago than they are now includes: 5.20,000-year-old deceased shallow-water corals occur in growth position far below the surface on the sides of oceanic islands. A.Global sea level today is falling as the water from the melted ice is returned to the oceans. B.Land bearing the unique marks of glaciers is sinking today, while regions just around that land are rising as deep hot rock flows back after being displaced by the glaciers. C.All of the answers are correct, making this is the best answer. D.Shells of creatures that lived in the ocean about 20,000 years ago indicate that the ocean water was especially isotopically light then. E.The land with the unique glacier marks was pushed down by the ice and now is bobbing back up, water returned to the oceans from the melting ice causes sea level to rise rather than to fall, and taking light water out of the oceans to grow ice sheets causes the remaining waters, and the shells, to be isotopically heavy. But, the dead corals in growth position down the sides of islands are evidence for the ice age. Points Earned:1/1 Correct Answer:A Your Response:A The recent changes in the amount of ice on Earth over time occurred: 6.Because of the actions of a Serbian mathematician, Milutin Milankovitch. A.