Earth
Which of these bodies of water would it be easiest to float and swim in?
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What polluting material can choke an animal by getting caught around its neck?
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What was the nationality of the scientist who demonstrated a heliocentric system?
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What is an underwater boat with its own power and air supply called?
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What is sedimentary rock composed primarily of sand-sized grains?
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On October 11, 1999 the world population hit a milestone of how many?
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