| A | B |
|---|
| Lithospere | The crust and the uppermost part of the mantle.30-60 miles deep;solid,cool,ridgid,rock |
| Asthenosphere | In the upper mantle;110-120miles deep;hot semi liquid rock(taffy like);flows very slowly |
| Continental crust | Made out of less dense rocks(granite)thicker crust(10-30)miles thick |
| Oceanic crust | Made out of dense rocks(basalt-ig rock);thinner crust;3-6miles thick |
| Alfred Wegener | Meteorologist who proposed the CDT |
| CDT | Theory that all continents were once joined together in one supercontinent called Pangea.200-300mya;broke apart and formed our modern continents |
| 200mya | Pangea split into Laurasia and Gondwanaland |
| 135mya | Gondwanaland breaks apart into Antarctica, Africa, S.America,Australia, and India |
| 40mya | Laurasia splits up into N.America, Europe/Asia, and Greenland;Life:Dinosars become extinct 65mya |
| How old is the Earth? | About 4.6 billion years old |
| 1.1bya | Rodinia-Single celled algae |
| 850mya | Rodinia splits up into land fragments |
| 700mya | Land fragments become Laurasis and Gondwanaland |
| 550mya | L and G started moving towards each other.Life:Shelled organisms appear |
| 300mya | Continents collide to form Pangea.Life @ 220 mya there was dinosaurs |
| What was the theory of the earth in the early 1900's | The earth was static |
