Dating in science

Relative dating does not provide actual numerical dates for the rocks.

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The method of reading the order is called stratigraphy (layers of rock are called strata).Throughout the history of life, different organisms have appeared, flourished and become extinct.Many of these organisms have left their remains as fossils in sedimentary rocks.This is because new sediments are always laid down on top of sediments that have already been deposited.So, when looking at the history of a cliff face, it is important to read the story it tells from the bottom layer up.