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Formation of a Graded Bed
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1

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What is the vertical pattern of grain sizes in a bed of sediment deposited by a turbidity current?
A)smallest grains are deposited at the bottom, with grains becoming coarser upward through the bed
B)largest grains are deposited at the bottom, with grains becoming finer upward through the bed
C)grains are randomly distributed by size within the bed
D)angular grains are deposited at the bottom of the bed, with round grains above
E)round grains are deposited at the bottom of the bed, with angular grains above
2
What is a turbidity current?
A)a wind-driven ocean current that carries muddy water offshore
B)a temperature-driven ocean current the carries warm water offshore
C)an ocean current carrying a high density of plankton
D)a gravity-driven flow of sediment-laden water that moves down the continental slope
E)a pressure-driven flow of sediment-laden water that moves up the continental slope





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