Radiometric age dating for kids white collar dating service

Therefore, their ages indicate when they were formed.

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We know the Earth must be at least as old as any rock on it.

Unfortunately, none of the original rocks still exist, so scientists had to use less direct evidence to determine the age of the Earth.

This means that all of the lead 204 on the Earth has been around since the formation of the Earth.

Based on extensive sampling of the Earth's crust, scientists determined the present-day abundances of the four isotopes of lead relative to each other and to the parent isotopes that produced three of them.

After one half-life, 50 percent of the original parents remains; after two, only 25 percent remains, and so on.

Decay curve of a radioactive element with a half-life equal to one time unit.One way to think about the closed system of the crystal is to compare it to an hourglass.The grains of sand in the top half of the hourglass are the radioactive parents, and those falling to the bottom are the stable daughters.Radiometric dating works best on igneous rocks, which are formed from the cooling of molten rock, or magma.As magma cools, radioactive parent isotopes are separated from previously formed daughter isotopes by the crystallization process.The discovery gave scientists a tool for dating rocks that contain radioactive elements.

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