[Quran 21:31] And We placed within the earth firmly set mountains, lest it should shift with them, and We made therein [mountain] passes [as] roads that they might be guided.
[Quran 78:6] Have We not made the earth an expanse,
[Quran 78:7] And the mountains as pegs?
[Quran 86:11] by Heaven with its cyclical systems