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Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| how many eras is the time scale divided into? | 4
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| waht are the four eras in order | precambrian, peleozoic mesozoic and cenozoic
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| 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.
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| 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).
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| Mesozoic | Is made up of Triassic, Jurassic, and the Cretaceous Periods. The Mesozoic Era is the age of Dinosaurs.
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| when did dinosaurs become extinct | `65 millions years ago
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| how many theories about dinosaur extinction are ther | 3
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| A large astroid hit Earth resulting in an Ice Age. The astroid hit the Yucatan Peninsula. | ...
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| A large Super Volcano (Mount Tambour erupted causing an Ice Age. | ......
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| India runs into Asia, causing the ice caps to melt, which indirectly caused an Ice Age. | ...............
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| cenozoic | Is made up of the Tertiary and Quaternary Periods. The Cenozoic Era is the age of mammals.
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