Discussion
In a normal fault the hanging wall moves
Answer: B
Correct answer: down relative to the foot wall
A normal fault drops the hanging wall relative to the foot wall, which lengthens the section horizontally - so normal faulting records extension, or tension, in the crust. Rift valleys and the graben structures within them are built from sets of them. In a borehole crossing a normal fault, part of the sequence is missing, since the beds have been dropped past one another.
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