Which factor contributing to rock movement is not demonstrated by the brick-and-wood experiment?

Name: Which factor contributing to rock movement is not demonstrated by the brick-and-wood experiment?
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Question

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The brick-and-wood experiment demonstrates factors contributing to rock movement such as the smoothness of the rock, presence of water, and angle of slope, but it does not specifically address the density of the rock as a contributing factor.

Which Factor Contributing to Rock Movement Is Not Demonstrated by the Brick-And-Wood