Glacial deposits, as well as striated and polished bedrock, indicate that two major episodes of glaciation took place during the _______________.
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Q42: _ is an informal term that encompasses
Q43: Between 1.3 and 1.0 billion years ago,
Q44: What are prokaryotic organisms?
Q45: Early gases that had begun to accumulate
Q46: The Grenville orogen probably resulted from closure
Q48: What is the first supercontinent recognized with
Q49: What are heterotrophic organisms?
Q50: What does the appearance of red beds
Q51: What do the Ediacaran fauna represent, and
Q52: Why are ultramafic volcanics rare in rocks
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