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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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