Concept:Compressional forces in the Earth's crust cause rock layers to bend and ripple.
These bends are called folds, and the mountains they create are known as fold mountains.
Explanation:When tectonic plates collide, they squeeze the crust from opposite sides.
This squeezing pressure is called a compressional force.
Instead of breaking, the softer rock layers buckle upward into arch-like folds.
Repeated folding over millions of years builds high mountain ranges.
Examples include the Himalayas, the Alps, and the Atlas Mountains.
Block mountains form mainly from faulting and vertical movement, not folding.
Residual mountains are leftovers of worn-down highlands.
Volcanic mountains are built from erupted lava and ash.
Thus, fold mountains are the direct result of compressional forces.
Answer:D. fold mountains.