Earth

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

More Questions from Earth
In weather terms, what turns to water in a "spring thaw"?
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What are large bodies of air with similar temperatures and moisture content called?
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What does Earth do to cause night and day?
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In the U.S., the spring equinox occurs in what month?
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Where was the lowest world temperature, -128.6 degrees?
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What is the typical color of snow?
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Which star is the closest one to Earth?
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On which continent is the biggest area of rain forest found?
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