Scientists have discovered why the 'broken world' following the worst extinction of all time lasted so long -- it was simply too hot to survive.

► Wildfires and acid rain caused devastation of land life at the end of the Permian. ► Tetrapods suffered massive losses, as severe as life in the sea. ► There were extinctions of plants and insects also, but perhaps less severe. ► Key killers for life on land were acid rain, mass wasting, and aridification. ►

Why did it rain for 2 million years?

Because in very hot climates, the rain cycle is sped up. Pangaea was one big land mass and rain storms would weaken and not reach the center of the continent. This led to world that could not adequately cool itself. The world became so hot that very little could survive.