Why is a stream able to pick up a grain of sand, but not a smaller grain of silt?
A) Gravity forces the silt to remain on the ground.
B) Certain patterns of water flow work better for larger particles.
C) Adhesion keeps the silt particles attached to the rock below.
D) Cohesion keeps the silt particles attached to each other.
Answer: D
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Indicate whether the statement is true or false.
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a. 5 billion b. 7 billion c. 9 billion d. 11 billion e. 13 billion
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