What causes the rock layers of mountains to form zigzag shape?
A. a transform fault
B. a normal fault
C. continental plate uplift
D. folding of rock
D. folding of rock
The correct answer is D. folding of rock.
Explanation: The zigzag shape of rock layers in mountains is primarily caused by folding of rock. This folding occurs as a result of intense pressure and stress acting on the Earth's crust. Over time, compression forces cause horizontal layers of rock to buckle, bend, and fold. This process is known as folding, and it can create various shapes, including zigzag patterns, in the rock layers. These folds can be seen in folded mountain ranges, such as the Himalayas or the Appalachian Mountains.