metamorphic
Faunal succession
lithification
The Piltdown man
During the Carboniferous Period
Earth was too hot to have solid rocks at that time.
It must have lived for a short geologic period of time.
A large asteroid colliding with the Earth would trigger a great cooling that might lead to some extinctions.
A large burning of fossil fuels (like we have been doing for 200 years) would trigger a great global warming that might lead to the extinction of all life on earth.
Shrinking of the polar ice caps
The current era today is Cenozoic
The formation of the ozone layer