Drastic Changes in the Earth

Isaiah 51:6:
When the day comes, of which the prophet proclaims:
'The heavens will disintegrate like smoke, and the earth will wear away like clothing,' the promise comes to an end."

Midrash Bereishis Rabba 34:11:
"Every ravine will be raised, and every mountain and hill lowered; gullied lands will become level, and rocky places meadows."

Isaiah 40:4:
"The mountains will be removed, and the hills dismantled; but My kindness will not be taken from you, and My covenant of peace will not be revoked, says G-d your comforter."

Isaiah 54:10:
"We do not fear when the earth changes, when mountains are dismantled in the heart of the seas." (Psalms, 46:3)