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To find clues to the past, scientists take core samples. They drive tubes into the ground then pull up samples of the layers.
To find clues to the past, scientists take core samples. They drive tubes into the ground then pull up samples of the layers.
Sediments build up slowly. A geologist can look at hundreds or thousands of years of history with one sample.
Sediments build up slowly. A geologist can look at hundreds or thousands of years of history with one sample.
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