Which percentage of the radioactive potassium-40 in a sample will have decayed in 2.6 X 10^9 years?

Based on Earth’s geologic history, which group of organisms has existed for the shortest amount of time?

Oxygen first became a major part of Earth’s atmosphere from the

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The region that is now Florida is inferred to have been positioned on the equator approximately

The division of geologic time into eras, periods, and epochs is based upon the

The first P-wave from an earthquake was recorded at 10:20:00 a.m. at a seismic station located 2200 km from the earthquake epicenter. At what time did the S-wave arrive?

Which two hot spots are located at plate boundaries?

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At which location is the greatest amount of deposition most likely occurring?

Instruments that record seismic waves on Mars allow scientists to infer the

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The two valleys most likely formed because the shale and limestone bedrock

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