Resisting strength is greater when

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When bedding planes are not parallel to a hillside, the rock is more likely to be subjected to compressional forces, which can increase its resisting strength. In contrast, when bedding planes are parallel to a hillside, the rock may be more susceptible to shearing forces, which can weaken it. Water percolating into rock along joints (B) and shale weathering to clay minerals (D) can both potentially weaken the rock and reduce its resisting strength.

Resisting Strength Is Greater When