Head to NCW web page to find out more about听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鈥檚 no 鈥渆stablished in鈥� 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 鈥� and even good old Mother Earth. For the听30th anniversary of National Chemistry Week, this edition of听Reactions听describes how scientists date rocks.
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