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How are relative ages of rocks measured?

How are relative ages of rocks measured?
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How are relative ages of rocks measured?

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User Jareth
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The newer ones are at the top and older at the bottom.
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User Sachin Kohli
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Geologists find absolute ages by measuring the amount of certain radioactive elements in the rock. When rocks are formed, small amounts of radioactive elements usually get included.
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User Evoskuil
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