THE 4TIME ERAS
Published on Nov 23, 2015
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PRESENTATION OUTLINE
Precambrian time began when the Earth originated 4.6 billion years ago, and continued until about 540 million years ago
By the hypothesis of scientist the earth began or developed from non living matter or chemicals that already existed on earth
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PALEOZOIC ERA: the mass Extinction known occurred at the end of the Paleozoic era, about 248 million years ago. As many as 90% of ask marine species died out.
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Mesozoic era: began about 248 million years ago and lasted about 183 million years
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