OLogy: What is Earth?

Take a peek at our planet’s layers, learn what secrets rocks reveal, and gain a long view of history.

Earth is the dynamic planet that we call home. It formed over 4.5 billion years ago, and it has been changing ever since. Sometimes these changes happen very fast, like an earthquake or a volcanic eruption. But most changes happen so slowly we don’t notice them at all!

What are the big ideas about Earth?


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