Major way Earth changed during each of the 4 major geologic eras?

Question

Can you shortly explain major way Earth changed during each of the 4 major geologic eras?

Answer 1

Well, you need to more specific. Earth has changed in many aspects (life, landmass, ocean level, climate, etc), more in some ways than others, so you need to specify in what capacity.

If you mean landmasses, then you can go to http://www.scotese.com to look at paleogeographic reconstructions. You can also see climate changes through time here too.

Pennsylvania's link is also informative for anything else you want to know.

Answer 2

http://wiki.cotch.net/index.php/History_...

This explains everything. Just scroll down to the ages. or use the clickable table of contents.