How do we know how old Earth is?

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How do we know how old Earth is? How do we know how old Earth is?

The earth is about 4.54 billion years old. In that time it has seen continents form and break up, ice caps expand and recede, and life evolved from single-celled organisms to blue whales. But how do we know the age of the earth? We start with a look inside. “If you’re an earth scientist and […] The post How do we know how old Earth is? first appeared on The Shepherd of the Hills Gazette.
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