In geology, the rock block below a fault is called the ______.

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Multiple Choice

In geology, the rock block below a fault is called the ______.

Explanation:
In a fault, the two blocks of rock are separated by the fault plane. The block below the plane is called the foot wall, while the block above is the hanging wall. The terms come from miners’ terminology—think of standing on the hanging wall above and it appearing to hang. Since the rock block in the space below the fault plane is being described, it is the foot wall. In movement terms, the distinction helps describe how blocks shift on different types of faults: for a normal fault, the hanging wall moves downward relative to the foot wall; for a reverse fault, the hanging wall moves up relative to the foot wall.

In a fault, the two blocks of rock are separated by the fault plane. The block below the plane is called the foot wall, while the block above is the hanging wall. The terms come from miners’ terminology—think of standing on the hanging wall above and it appearing to hang. Since the rock block in the space below the fault plane is being described, it is the foot wall. In movement terms, the distinction helps describe how blocks shift on different types of faults: for a normal fault, the hanging wall moves downward relative to the foot wall; for a reverse fault, the hanging wall moves up relative to the foot wall.

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