Micah 1:4

The mountains shall be molten: if literally understood, we know it hath been so: when God will kindle that fire which shall burn up the earth, and the works of it, as he will when he cometh finally to judge the world, it shall be done again. But figuratively mountains are mighty states and kingdoms, flourishing with prosperity, and which do think the foundation of this sure as mountains. So Amos 6:1,2 Hab 3:6 Isaiah 2:14, Or possibly these mountains may be, by a synecdoche, put for those who dwell on them, mountaineers, who were usually more fierce, secure hardy, and of difficult access, and therefore less regardful of threats and punishments. Shall be molten under him: which way soever you take mountains, yet the effect of God's powerful anger and justice shall be this, they shall be no more able to bear his indignation, or withstand it, than that which like wax melts before a strong fire. The valleys; which either are emblems of the lower sort of men, or the men that dwell in the valleys with their cities built there, which might hope to escape the storm, lying more under covert. But such shall be the sweeping, searching, and rapid storm of God's judgments, that no places, no persons shall either withstand or divert them. Shall be cleft; or rent in sunder, broken up, as the word Genesis 7:11, and slide away. As wax, which doth easily and speedily dissolve, and run before the fire. And as the waters that are poured down a steep place; which immediately spreads itself and runs down the precipice, not able to keep together in one body, but scattered one part from other, loseth itself without remedy; so shall the glory and strength of Samaria melt away before the fire of God's displeasure executed by Shalmaneser, and by Sennacherib and Nebuchadnezzar on Judah.