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    Radiometric age dating half life

    At any moment, the ratio between them is a measure of the time elapsed, as long as the system remains closed.But if the hourglass were to break (become an open system), sand leaks out and the hourglass is no longer a reliable tool for telling time.

    These rates are usually expressed as the isotope's half-life--that is, the time it takes for one-half of the parent isotopes to decay.Ideally, the mineral crystals in igneous rocks form a closed system--nothing leaves or enters the crystal once it is formed.This means that as radioactive parent elements decay, they and their daughters are trapped together inside the crystal.Therefore, their ages indicate when they were formed.Because all parts of the solar system are thought to have formed at the same time (based on the solar nebula theory), the Earth must be the same age as the moon and meteorites--that is, about 4.6 billion years old.

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