There can be created by tectonic activity, such as two tectonic plates smashing into each other and forming a mountain. They can be formed by volcanic activity. Mountains can also be carved out of the landscape by glaciers.
A mountain is usually produced by the movement of lithospheric – the rigid outermost shell of a rocky planet – plates, either orogenic movement or epeirogenic movement. The compressional forces, isostatic uplift and intrusion of igneous matter forces surface rock upward, creating a landform higher than the surrounding features. Though it is true they can also be created and subject to glaciation, as well as volcanic activity which usually slowly builds a mountain.
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