Earth

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

More Questions from Earth
Which of the world's oceans is larger than all of the Earth's land area combined?
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What are the rocks that glaciers carry with them to far places called?
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The science term "weather vane" is best defined as which of these?
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What is the theory that describes how the continents got where they are today?
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What is water treated with to prevent bacteria from growing?
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What zone is between the Earth and the atmosphere?
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What is in the sky if it is overcast?
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How many continents does Earth have?
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