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New dating methods are invented all the time, however, most have practical limitations.Geologic research and mapping requires the determinations of the ages and composition of rocks.As an example of how they are used, radiometric dates from geologically simple, fossiliferous Cretaceous rocks in western North America are compared to the geological time scale.

They have also concluded that dinosaurs lived on the Earth for about 200 million years.

These exceptional lengths of time seem unbelievable, but they are exactly the spans of times that scientists use to describe the Earth. When did the giant Rocky Mountains form and when did dinosaurs walk the Earth?

To answer these questions, you have to think about times that were millions or billions of years ago.

Historical geologists are scientists who study the Earth's past.

They study clues left on the Earth to learn two main things: the order in which events happened on Earth, and how long it took for those events to happen.

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