The Nature Reborn Mod adds EPIC disasters into Minecraft!
In this 1.6.4 Nature Reborn Mod Showcase:
This Minecraft Mod adds epic natural disasters into Minecraft. The Volcano spawns with obsidian, and ores around and erupts blocks every minute or so. The Earthquake creates huge gaps in the ground that go down to the bottom of the world. The Meteors crash from the sky and cause lava and ore to spawn. The Sinkholes drop you down to the bottom of the world where a lava pool lies.
Get your Minecraft Mod here: