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To date a radioactive rock, geologists first measure the “sand grains” in the top glass bowl (the parent radioisotope, such as uranium-238 or potassium-40).They also measure the sand grains in the bottom bowl (the daughter isotope, such as lead-206 or argon-40, respectively).See the background information on Students will use half-life properties of isotopes to determine the age of different "rocks" and "fossils" made out of bags of beads.

Part 1 (in the previous issue) explained how scientists observe unstable atoms changing into stable atoms in the present.

Absolute-age dating is way for scientists to tell the exact age of a rock, fossil, or other object. Isotopes are atoms of the same element that have the same chemical properties. These isotopes are found in igneous and metamorphic rocks.

This process involves measuring the rate of decay of radioactive isotopes.

We could be sure that a mineral containing parentium originally had no daughterium.

If the mineral contained 1 part per million Parentium-123 and 3 parts per million Daughterium-123, we could be sure all the Daughterium-123 was originally Parentium-123.

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Los orígenes de la historia del libro se remontan a las primeras manifestaciones pictóricas de nuestros antepasados, la pintura rupestre del hombre del paleolítico.

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