2 Peter 3:10-12

But the day of the Lord will come as a thief by night; in which the heavens shall pass away with a rushing noise, and the first principles of matter in flames dissolve, and the earth and all the works upon it be burnt up.

Revelation 20:11

And I saw a great white throne, and one sat upon it, from whose presence fled the earth and the heaven, 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 as a thief by night; in which the heavens shall pass away with a rushing noise, and the first principles of matter in flames dissolve, and the earth and all the works upon it be burnt up.
Revelation 20:11
And I saw a great white throne, and one sat upon it, from whose presence fled the earth and the heaven, and no place was found for them.