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14-Sep-2017 10:16

The realization that sediments turn into rock was counter to the view that all rocks on Earth formed in a single creation event.Once Steno recognized that the fossils he was contemplating (sharks teeth and sea shells) were formed in the sediments of oceans he was able to work out the basic rules of stratigraphy.However, "relative" dating or time can be an easy concept for students to learn.

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Sequencing the rock layers will show students how paleontologists use fossils to give relative dates to rock strata.

Numerical dating determines the actual ages of rocks through the study of radioactive decay.