Why Is a Stream Able to Pick Up a Grain

question 68

Multiple Choice

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.

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