Mountains are formed when magma from underneath the Earth’s crust is pushed up, but doesn’t actually break through the Earth's crust. The magma overtime cools and hardens into hard rock. The layers of softer rock above the hard rock, made by the magma erodes away and you’re left with a large dome-shaped mountain. Overtime the magma breaks throught the hard rock and a volcano is formed.
There is another main way of how mountains are formed. The Earth’s plates crash together. Because their is so much force in this collision, the sides of the plates crumple. Mountains are created because of those crumpling plates.
How mountains are formed ? : This is a link to a video wich shows how mountains are formed.
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