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The ratio of radiocarbon to stable carbon atoms in the atmosphere has varied in the past.

This is because the amount and strength of cosmic radiation entering the earth's atmosphere has varied over time.

(This, in turn, is caused by variations in the magnetic fields of the earth and sun, for example.) Although the ratio of radiocarbon to stable carbon in the atmosphere has varied over time, it is quite uniform around the globe at any given time because the atmosphere mixes very quickly and constantly.

Plants obtain all their carbon atoms from the atmosphere.

Meteorites are among the oldest objects we know about - formed about 4.5 billion years ago. This article describes the principles and methods used to make that determination.

) Gen1Denying Evolution Evolution=Millions Of Years Your Imagination 2 Peter 3:5 "For this they are willingly ignorant of, that by the Word of God the heavens were of old, and the earth standing out of the water and in the water:" New Light on Radiometric Dating (Creation Moments.com)Most people find the subject of radiometric dating too technical to understand.

After the second half-life has elapsed, yet another 50% of the remaining parent isotope will decay into daughter isotopes, and so on.

For all practical purposes, the original isotope is considered extinct after 6 half-life intervals. A small portion of a meteorite is vaporized in the device forming ions.

When granite rock hardens, it freezes radioactive elements in place.

The most common radioactive element in granite is Uranium-238.