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Science Grade 7
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What method do scientist use to find out the Earths age?
radioactivity
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In which era did dinosaurs roam the Earth?
The Mesozoic era
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How old is the Earth?
4600 million years old
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In what eon do we live?
Phanerozoic eon
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In what EON did oxygen form?
Proterozoic eon 2500–542 million years ago
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When did the first microscopic organism appear in the ocean?
Archean eon 3800–2500 million years ago
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What are eons divided into?
Eras and Periods
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In what eon did the ocean appear?
Hadean Eon.
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What do Geologist call the time periods of the Earth?
Eons
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