Earth
What fuel comes from the remains of 300-million-year-old decayed fern plants?
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What igneous formation is usually seen in the core of folded mountains?
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What is the imaginary line that runs from the North to the South Pole called?
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What percentage of known volcanoes are subaerial, meaning they erupt into the atmosphere?
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What layer of the Earth's atmosphere contains the ozone layer?
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What makes Florida's Tampa Bay a unique aquatic environment?
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What is the current era in the geologic time scale?
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