Earth

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

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Which material do fossils make more attractive to an architect?
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What is the name for a 100 foot tall tidal wave?
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What water movement is similar to a jet stream in the air?
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From which does the Global Positioning System receive its information?
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What country forms a 2000-mile archipelago along the east coast of Asia?
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What is the estimate of the true age of a mineral or rock called?
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Ruby and sapphire are gem forms of which mineral?
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Which of these rivers is most likely a glacial boundary river?
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