About strong mountain foundations in Qur'an

The surface of the earth is broken into many rigid plates that are about 100 km in thickness.These plates float on a partially molten region called aesthenosphere.
Mountain foundations occur at the boundary of the plates.The earth crust is 5 km thick bellow oceans, about 35 km thick bellow flat continental surface and almost 80 km thick below great mountain ranges.

The Qur'an clearly mentions the function of the mountains in preventing the earth from shaking :

"And We have set on the earth mountains standing firm, lest it should shake with them."

[Al-Qur'an 21:31]

 

The Qur'an refers to the strong foundation of mountains in the following verse:


"And the mountains hath He firmly fixed."

[Al-Qur'an 79:32]

Thus the information contained in the Glorious Qur'an about the nature of mountains is in perfect agreement with recent discoveries in geology.