Translation:

14. And the earth is moved and its mountains and they are crushed to powder at one stroke

Notes (Tafseer)

5649. The whole of our visible world, as we now know it, will pass away, and a new world will come into being. The mountains are specially mentioned, because they stand as the type of hardness, size, and durability. They will be "crushed", i.e., lose their form and being at one stroke.