2 Peter 3:10-12

But the day of the Lord will come as a thief in the night, in which the heavens shall pass away with a great noise, and the elements being set on fire shall be dissolved, and the earth and the works therein shall be burnt up.

Revelation 20:11

And I saw a great white throne, and Him that sat on it, from whose face the earth and the heaven fled, 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 in the night, in which the heavens shall pass away with a great noise, and the elements being set on fire shall be dissolved, and the earth and the works therein shall be burnt up.
Revelation 20:11
And I saw a great white throne, and Him that sat on it, from whose face the earth and the heaven fled, and no place was found for them.