Essay - Geography 1.a) the Earth is Estimated to be About 4.54...

Geography

1.a) The earth is estimated to be about 4.54 billion years old b) The oldest rocks are found in northwestern Canada near Great Slave Lake. They ***** 4.03 *****illion years old.

2.a) The dinosaurs lived in the Mesozoic Era.

A b) We live in the Phanerozoic Eon

3. The origin of ***** Milky Way is estimated at 11 to 13 billion years old. ***** Universe is estim*****ed ***** ***** 1 to 4 years *****er than the *****.

4.a) Hydrogen b) Helium

5. The earliest evidence of life on ***** is 3.5 ***** years old.

6. Life on earth could not exist for the first billion years of ***** planet's existence because of comet and asteroid impacts. These made the Earth's surface too hot for enough water and carbon-based molecules to favor the formation of life.

7. Differences in density causes the subduction of one oceanic plate under another.

8.a) the fit ***** the continents b) ***** distribution of fossils c) a similar sequnce of rocks at various locations.

9.a) Closing: Mediterranean Sea b) Openins: Atlantic Ocean

10. The crust is 30km thick at