01:460:100.09: Planet Earth Test 4 May 8, 2011s Name l Of the choices below, whi
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01:460:100.09: Planet Earth Test 4 May 8, 2011s Name l Of the choices below, which portions of the sea floor are most steeply tilted A. continental slopes B. abyssal plains C. continental rises D. continental shelves 2. The ultimate base level for a stream is A. sea level B. the average elevation of the continent on which the stream is found C. the average elevation of the bottom of the ocean D. about 30 meters below sea level 3. A beach is typically wider in the winter than the summer A. True B. False 4. Surface water currents are driven bywhile deep water currents are driven by A. sunlight, salt B. temperature, salinity C. wind, density D. carbon dioxide, oxygen When a single beach groin is constructed: A. Sand accumulates on the updrift (upcuren) side, lading to erosion on the downdrift (downcurento side B. Sand accumulates on the downdrift (downcurrent) side, leading to erosion on the updrift (upcurent side 5. 0 There is no change to the beach D. The beach is improved as there is an area provided for crabbing 6. The height of an ocean wave increases as A. the distance over which the wind blows over the water decreases B. the wind blows for longer times C. the wind speed decreases D. all of the above Barrier islands migrate landward during periods of sea level rise A. true 7. B. false There are A. 4 C. 3 major oceans on the earth B. 7 D. 5 8. E. 9 9. The principle difference between a debris flow and a mudflow is the A. is based on past earthquake activity B. grain size of the moving mass C. debris flow contains abundant water, whereas the mudflow is dry D. debris flow contains pyroclastic debris from a volcanic eruptionExplanation / Answer
1.the answer is A=continental slope, because it is slope between deep ocean floor and outer continental shelf edge.
2.The answer is A=sea level, it is normally the mouth of the rivers.
3.The answer is false, it is wider in summer than in winter, this is because the offshore sand moves towards landward in sunmer.
4.The answer is c=wind and density, deep ocean currents are driven by the density and tenptempera but surface are due to winds.
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