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Science Grade 7
Game Code: 830466
English
9
Public
Earth
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How old is the Earth?
4600 million years old
15
What method do scientist use to find out the Earths age?
radioactivity
15
What do Geologist call the time periods of the Earth?
Eons
15
In what eon do we live?
Phanerozoic eon
25
In what eon did the ocean appear?
Hadean Eon.
15
When did the first microscopic organism appear in the ocean?
Archean eon 3800–2500 million years ago
20
In what EON did oxygen form?
Proterozoic eon 2500–542 million years ago
15
What are eons divided into?
Eras and Periods
20
In which era did dinosaurs roam the Earth?
The Mesozoic era
15
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