Relate radioactive dating techniques to isotopes deanna dating again

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There are certain radioisotopes that occur in living things in a fixed ratio with stable isotopes of that element while the organism is alive because that is the ratio in the environment it is living in.

Once the organism dies it decouples from its environment and no longer maintains that ratio.

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Isolated tribal groups in South America, Africa, and New Guinea, for example, have extensive knowledge about plants and distinguish hundreds of kinds according to their utility, as edible, poisonous, or otherwise important in their culture.In addition to the ages of Earth, Moon, and meteorites, radiometric dating has been used to determine ages of fossils, including early man, timing of glaciations, ages of mineral deposits, recurrence rates of earthquakes and volcanic eruptions, the history of reversals of Earth's magnetic field, and the age and duration of a wide variety of other geological events and processes.Every radioisotope has a half life, in which half of it decays to another isotope (radioactive or not).All rocks and minerals contain long-lived radioactive elements that were incorporated into Earth when the Solar System formed.These radioactive elements constitute independent clocks that allow geologists to determine the age of the rocks in which they occur.

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