Earth

What is amber?

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What type of radar measures radial velocity?
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What is the common name for the Cenozoic Era?
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What does granite become when put under heat and pressure?
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Which of these is the longest river in the world?
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What evidence tells scientists that some dinosaurs may have lived together in groups?
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What is the estimate of the true age of a mineral or rock called?
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How often is the earth hit by lightning?
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What happens to the pressure of water as depth under the water increases?
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