On which part of a slope would rocks tend to fall at the highest speeds?

Name: On which part of a slope would rocks tend to fall at the highest speeds?
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Question

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Rocks would tend to fall at the highest speeds on a free face, which is a steep slope with a smooth surface that is not covered by vegetation or debris, allowing the rocks to gain momentum as they fall. The other options (waning slope, waxing slope, debris slope, and pediment) do not provide the same conditions for rocks to accelerate to high speeds.

On Which Part of a Slope Would Rocks Tend to Fall