2 Peter 3:10-12

The Day of the Lord will come like a thief; and on that day the heavens will pass away with a crash, the elements will be burnt up and dissolved, and the earth and all that is in it will be disclosed.

Revelation 20:11

Then I saw a great white throne, and him who was seated on it. 'The earth and the heavens fled from his presence; no place was left 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
The Day of the Lord will come like a thief; and on that day the heavens will pass away with a crash, the elements will be burnt up and dissolved, and the earth and all that is in it will be disclosed.
Revelation 20:11
Then I saw a great white throne, and him who was seated on it. 'The earth and the heavens fled from his presence; no place was left for them.'