Question

Mountains are usually formed by:

movement of the earth's crust


placement of eroded land

weathering away of land


volcanic explosions

Answer 1

movement of the earth's crust

Step-by-step explanation:

Mountains form where two continental plates collide. Since both plates have a similar thickness and weight, neither one will sink under the other. Instead, they crumple and fold until the rocks are forced up to form a mountain range. As the plates continue to collide, mountains will get taller and taller.