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4 relative dating principles

In fact, until the eighteenth century, it was commonly believed that the Earth was no older than a few thousand, or at most, million, years old.

They quickly realized that millions of years were necessary to accumulate the rock layers we see today.

As the amount of evidence grew, scientists were able to push the age of the Earth farther and farther back in time.

However, it was not until this century that nuclear age technology was developed that uses measurements of radioactivity in certain types of rocks to give us ages in numbers of years.