Earth

What evidence tells scientists that some dinosaurs may have lived together in groups?

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How many days a year is the sun invisible at the North Pole?
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What was TIROS I, launched on April 1, 1960?
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What is a reason for the Earth's seasons?
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At what point would one be standing if the trees were stunted?
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Lightning struck what eight times in 24 minutes?
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What is the theory that describes how the continents got where they are today?
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Which of these terms can be used to describe steam?
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In the U.S., the spring equinox occurs in what month?
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