Isotope used for radioactive dating. Plants acquire it through photosynthesisand animals acquire it from consumption of plants and other animals.

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Concepts Deep time Geological history of Earth Geological time units.

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The two uranium isotopes decay at different rates, and this helps make uranium-lead dating one of the most reliable methods because it provides a built-in cross-check.

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UExcel Weather and Climate:

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These rocks intrude even older rocks that have not been dated.

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Namespaces Article Talk.

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What is the Age of the Solar System?

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As we age, our hair turns gray, our skin wrinkles and our gait slows.

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How An Atom Loses Protons.