Earth
Which of the following minerals is the hardest?
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What type of clouds are thick and puffy and can sometimes turn into thunderstorms?
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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 system consisting of the Earth's sun and the eight planets orbiting it called?
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Which of these is a spiral storm that can be many miles wide?
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What is a region of Earth in which all areas share the same time called?
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There are over one quadrillion of what animal on Earth?
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