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jman

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jman
which planet has the lowest density?
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jman
What does a rift zone look like?
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jman
What is a rift?
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jman
The major landforms in Western North America were formed during?
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jman
A fossil with skin and muscles in tact was preserved through? Thick deposits of petroleum form? A common petrifying mineral is?
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jman
What isotope to use to determine age 8,000 to 20,000?

1 to 6 of 6