How do scientists use relative dating to reconstruct geologic history

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For more than two billion years -- half the diagram -- almost no action. For example, ammonites lived in the Mesozoic era. Scientific explanation based on dating establishes the third. There are radiocarbon dating cannot establish the relative age dating rocks to date objects older the material was found. Long before I understood what any of it meant, I'd daydream in science class, staring at this chart, sounding out the names, wondering what those black-and-white bars meant, wondering what the colors meant, wondering why the divisions were so uneven, knowing it represented some kind of deep, meaningful, systematic organization of scientific knowledge, and hoping I'd have it all figured out one day. Here is an easy-to understand analogy for your students:

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Next time you find a cliff or road cutting with lots of rock strata, try working out the age order using some simple principles:.

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Geologic Age Dating Explained

Already a Member, Log In: Look how squished the Moon's history is! And so on. This is called the Rule of Superposition. Dinosaurs disappeared about 65 million years ago. In this way we can determine relative ages for things that are far away from each other on a planet. For example, which is older, the bricks in a building or the building itself?

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