2 Peter 3:10-12

But the day of the Lord will come like a thief, in which the heavens will pass away with a roar and the elements will be destroyed with fire, and the earth and the works that are in it will be burned up.

Revelation 20:11

Then I saw a great white throne and him who sat upon it; from his presence earth and sky fled away, and no place was found for them.

Treasury of Scripture Knowledge

Summary

And the mountains shall be molten under him, and the valleys shall be cleft, as wax before the fire, and as the waters that are poured down a steep place.

Bible References

The mountains

2 Peter 3:10
But the day of the Lord will come like a thief, in which the heavens will pass away with a roar and the elements will be destroyed with fire, and the earth and the works that are in it will be burned up.
Revelation 20:11
Then I saw a great white throne and him who sat upon it; from his presence earth and sky fled away, and no place was found for them.