How Do We Know the Age of the Earth?

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Reactions Science Videos | October 23, 2017

Head to NCW web page to find out more about National Chemistry Week! The Earth is 4.565 billion years old, give or take a few million years. How do scientists know that? 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.

Sources:

The Geological Society
Lead Isotopes as a Current Scientific Clock
How Science Figured Out the Age of Earth
How do we know the Age of the Earth?
Catastrophism
Rock Stars - Arthur Holmes: An Ingenious Geoscientist
Dear Science: How do we know how old the Earth is?
Age of the Earth

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