The Deccan is a peninsular plateau located in central India that includes inland sections of the states of Andhra Pradesh, Maharashtra and Karnataka.
Millions of years ago, melted rock (lava) erupted from beneath the Earth's surface and spilled out over the ground. The lava spread out and hardened into a layer of rock on the surface.
The Deccan Traps formed between 60 and 68 million years ago, at the end of the Cretaceous period. The bulk of the volcanic eruption occurred at the Western Ghats (near present-day Mumbai) some 66 million years ago.
All of the other events can be explained by colliding worlds in the early solar system but the asteroid belt can't. The asteroid belt originated from the primitive solar nebula as a congregation of planetesimals, which were the precursors of the protoplanets.
