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Recorded history only began about ,000 years ago.  Humans have lived on Earth at least 200,000 years.  What took them so long?

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Recorded history only began about ,000 years ago.  Humans have lived on Earth at least 200,000 years.  What took them so long?

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Seven billion humans now live on Earth.  That puts a strain on the sharing of resources.

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Seven billion humans now live on Earth.  That puts a strain on the sharing of resources.

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The Geologic Time Scale is determined by radiometric dating and depth that fossils are found. 

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The Geologic Time Scale is determined by radiometric dating and depth that fossils are found. 

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There have been several over time. When Pangea formed a mass extinction wiped out about 90% of all marine life.

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Dinosaurs first appeared during the Triassic Period. 

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Dinosaurs first appeared during the Triassic Period. 

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Wegner's theory that all land was once joined.

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The Paleozoic Era is called" the age of ancient life"

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The Paleozoic Era is called" the age of ancient life"

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developed near deep hot ocean vents. It could photosynthesize, creating oxygen.

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hit near the Yucatan Peninsula gouging out a huge crater.