| Question |
Answer |
| how many eras is the time scale divided into? |
4 |
| waht are the four eras in order |
precambrian, peleozoic mesozoic and cenozoic |
| Precambrian Era- |
Is the oldest era and lasted the longest amount of time (approx. 4 billion years). Organisms were bacteria, sea pens (fans) and jellyfish.
|
| Paleozoic Era (age of fishes |
Is made up of the Cambrian, Ordovician, Silurian, Devonian (age of amphibians), Carboniferous (age of forests), and Permian (extinction of trilobites). |
| Mesozoic |
Is made up of Triassic, Jurassic, and the Cretaceous Periods. The Mesozoic Era is the age of Dinosaurs.
|
| when did dinosaurs become extinct |
`65 millions years ago |
| how many theories about dinosaur extinction are ther |
3 |
| A large astroid hit Earth resulting in an Ice Age. The astroid hit the Yucatan Peninsula. |
... |
| A large Super Volcano (Mount Tambour erupted causing an Ice Age. |
...... |
| India runs into Asia, causing the ice caps to melt, which indirectly caused an Ice Age. |
............... |
| cenozoic |
Is made up of the Tertiary and Quaternary Periods. The Cenozoic Era is the age of mammals.
|
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