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Scientists use relative dating to determine

The written record of human history, measured in decades and centuries, is but a blink of an eye when compared with this vast span of time. In fact, until the ehteenth century, it was commonly believed that the Earth was no older than a few thousand, or at most, million, years old. Scientific detective work and modern radiometric technology have only recently unlocked the clues that reveal the ancient age of our planet.

Scientists use relative dating to determine

Scientists use relative dating to determine

This image from Lake Mead NRA shows a sequence of sedimentary rock layers. The oldest layers, Cambrian (570-505 million years ago) are at the base, with younger layers piled on top.

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  • The older layers are lower 'relative' to the younger layers.


    Scientists use relative dating to determine

    Scientists use relative dating to determine

    Scientists use relative dating to determine

    Long before scientists had developed the technology necessary to assn ages in terms of number of years before the present, they were able to develop a 'relative' geologic time scale. They had no way of knowing the ages of individual rock layers in years (radiometric dates), but they could often tell the correct sequence of their formation by using relative dating principles and fossils.

    Scientists use relative dating to determine

    Geologists studied the rates of processes they could observe first hand, such as filling of lakes and ponds by sediment, to estimate the time it took to deposit sedimentary rock layers. PORTER'S 5 FORCES ONLINE DATING They quickly realized that millions of years were necessary to accumulate the rock layers we see today.


    Scientists use relative dating to determine:

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