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What process uses rock layers and index fossils to determine an object estimated age

User Agustinus
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Answer:

related dating is the answer

Step-by-step explanation:

User Electrichead
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Scientists combine several well-tested techniques to find out the ages of fossils. The most important are Relative Dating, in which fossils and layers of rock are placed in order from older to younger, and Radiometric Dating, which allows the actual ages of certain types of rock to be calculated. Relative Dating.