Question

Why are the fold mountain called so?In short

Answer 1

The forces responsible for formation of fold mountains are called orogenic movements. The term orogenic has derived from a Greek word meaningmountain building. These forces act at tangent to the surface of the earth and are primarily a result of plate tectonics.

Answer 2

Fold mountains are mountains formed mainly by the effects of folding on layers in the upper part of the Earth's crust
hope it helps:)