Climates+and+Geologic+Events

Geologist believe that Earth is approximately 4.6 billion years old. Evolutionary scientist think life on Earth began more than 3 billion years ago. Life on Earth has been altered by changing climates and geologic events. Scientist think the mass extinctions following the Paleozoic and Mesozoic Eras could be evidence of catastrophic events.

= The Day the Mesozoic Died = https://www.youtube.com/watch?v=6R5iLL7h5HQ&list=UUdofq4hHbT3ZDzgYUqsDd1A&index=26