Reactions

How Do We Know How Old the Earth Is?

09/10/2018 | 4m 27s | Video has closed captioning.

Since there’s no “established in” plaque stuck in a cliff somewhere, geologists deduced the age of the Earth thanks to a handful of radioactive elements. With radiometric dating, scientists can put an age on really old rocks — and even good old Mother Earth. For the 30th anniversary of National Chemistry Week, this edition of Reactions describes how scientists date rocks.

Aired: 09/10/18

Rating: NR

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Problems Playing Video? | Closed Captioning