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Earth Sciences
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OpenStudy (anonymous):
The Phanerazoic Eon is divided into Eras based on Question 6 options: the law of superposition evidence of mass extinctions or explosions of life layers of rocks absolute dating techniques
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OpenStudy (astrophysics):
I like to use this pic, notice how the eras are highly dependant on when species had gone extinct and when species had appeared |dw:1447930904036:dw|
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