Explanation:
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They began to form by a combination of volcanic activity and the deposit of marine sediments. It formed along northwest Africa about 530 million years ago. ... As the Appalachian Mountains eroded, sand and clay were deposited over Florida's limestone layer.
The another name for the equatorial coordinate system is B. Celestial.
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Since when you write in scientific notation and the first number has to be infront the decimal, it would be 6x10^-6 and it would be a negative because you moved the decimal to the write and not the left to make it positive hope this helps :))))
