Earth
There are over one quadrillion of what animal on Earth?
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What color was the dust that swept the Great Plains?
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What type of rock forms from melted rock and comes to the surface to harden?
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What polluting material can choke an animal by getting caught around its neck?
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What is the theory that describes how the continents got where they are today?
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What is the name given to a fossil that best defines a rock layer's age?
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