How does geological time help scientists keep track of events in Earth's history?

Scientists use the geologic time scale to illustrate the order in which events on Earth have happened. They used relative dating to divide Earth's past in several chunks of time when similar organisms were on Earth. Later, scientists used absolute dating to determine the actual number of years ago that events happened.

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i think the answer to your question is: settlement of the interior and economic growth. ( ^_^)／