Earth

What is the origin of dinoflagellates?

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What imaginary line divides the Earth's northern and southern hemispheres?
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What type of energy sources can't be replaced readily within a 30-year span?
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What is the area filled with groundwater called?
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Ruby and sapphire are gem forms of which mineral?
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Which of these landforms is an area of land lying between hills or mountains?
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Where would you find the abyssal plain?
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What are large bodies of air with similar temperatures and moisture content called?
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What is a region of Earth in which all areas share the same time called?
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