Earth

What is the name given to a fossil that best defines a rock layer's age?

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Which mineral is not likely to be a replacement mineral in fossils?
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How many days does it take for the Earth to revolve around the sun?
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What word means a mild or moderate temperature?
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What is a meteoroid called if it lands on the Earth's surface?
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Alaska and what state have record highs of 100 degrees?
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Who first charted the Gulf Stream?
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What produces more energy than all the world's nuclear weapons combined?
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In weather terms, what does the Fujita scale classify?
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