Why Are the Deposits of Streams Graded with the Largest

question 5

Multiple Choice

Why are the deposits of streams graded with the largest boulders or pebbles at the bottom?

• A)The largest boulders are always at the bottom; they never move.
• B)The largest boulders eroded from the stream bank immediately roll to the bottom and stay there.
• C)Jostling of boulders, pebbles, and sand in turbulent water moves the boulders to the bottom.
• D)As the water slows after a flood, the largest boulders drop out first.
• E)Tributaries add additional sediment to the stream.

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