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Soluble rocks (dissolution) Sinkhole; as the water filters down through the rocks above, the salt starts to dissolve and the rocks above drop down to form a sinkhole. Ground dissolution occurs when water passing through soluble rocks produces underground cavities and cave systems. These cavities reduce support to the ground above and can cause localised collapse of the overlying rocks and deposits.
BROKEN ROCKS. Joint: A break in a rock (crack) in which there is no relative movement of either side across the break. Fault: A break in the Earth in which the rocks on either side of the break have been displaced (vertically and/or horizontally) relative to each other (see pictures below).Strike-Slip fault: Movement of the Foot Wall and the Hanging Wall blocks is parallel to the strike of the fault plane. These faults form from.he difficulty is that it requires that the student think in 3-D -- which is a difficult skill to learn. However, there is hope! Knowing a few simple rules (and a lot of terminology) can allow even the beginning geologist to handle some rather complex structural problems.