Earth
What substance can layers of decayed plants form over time?
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What can help farmers control erosion in their fields?
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What makes Florida's Tampa Bay a unique aquatic environment?
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What deposit of sediment forms where a stream enters a standing body of water such as a lake?
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What does granite become when put under heat and pressure?
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What type of gem is the Star of Africa or the Cullinar II?
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What fuel comes from the remains of 300-million-year-old decayed fern plants?
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