Question

what are fold mountains?where are they located?

Answer 1

Fold mountains are mountain ranges which are formed when two of the tectonic plates that make up the Earth's crust push together at their border.
egThe Alps fold mountain range are located in Central Europe and cover Austria, Italy, Switzerland, Germany and France. 
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Answer 2

Fold mountains are mountain ranges which are formed when two of the internal (tectonic) plates that make up the Earth's crust push together at their border.
for examples are The Alps fold mountain range are located in Central Europe and cover Austria, Italy, Switzerland, Germany and France.