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How can limestone deposits be used to learn about earth’s history?

User Raugaral
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Answer:

Limestone is made of compacted dead organisms, generally from the deep sea. From this, we can gather insight regarding organisms living in oceans from thousands and millions of years ago.

Step-by-step explanation:

User TomCobo
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Limestone is made of compacted dead organisms, generally from the deep sea.  From this, we can gather insight regarding organisms living in oceans from thousands and millions of years ago.
User Leonid Zakharov
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