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    Math in carbon dating

    Instead of returning to the atmosphere, the carbon from these lifeforms is trapped within the Earth.

    Because the cosmic ray bombardment is fairly constant, there’s a near-constant level of carbon-14 to carbon-12 ratio in Earth’s atmosphere.

    When plants and animals die, much of their carbon is returned to the atmosphere as the organisms decompose.

    Every so often, a plant or animal does not decompose right away.

    Historians can tell what cultures thrived in different regions and when they disintegrated.

    Anthropologists can describe a people’s physical character, culture, and environmental and social relations.

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