[qam1]

The teacher is more right than you.

The methane form the Ice is stupid but Climate Change from the Deccan traps going on at the time no doubt lead to the Dinos extinction.

That thin layer of Iridium represents 10,000 to 100,000 years of deposit, please explain how Iridium which is the 2nd most densest element (2x denser than lead) can stay up in the atmosphere that long? I would also point out no dinosaur fossils are found IN that layer, where as if a asteroid wiped them out the Iridium layer would be full of fossils.

[econjack]

The fossils are found in that layer, just not above it. Also, carbon dating on the fossils shows an extremely narrow time frame for their deaths, such as one would find with a catastrophic event. The ability of particulates to stay airborne depends on the size of each particle and the wind speed that carries it. The fact that the layer exists everywhere on earth suggests that wind speeds were capable of widespread dispersion of the particles, which were small at the time.