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Radioactive elements were incorporated into the Earth when the Solar System formed.

All rocks and minerals contain tiny amounts of these radioactive elements.

Radioactivity and radioactive decay are spontaneous processes.

Learn about half-life and how it is used in different dating methods, such as uranium-lead dating and radiocarbon dating, in this video lesson. As we age, our hair turns gray, our skin wrinkles and our gait slows.

Statistical probablity is the only thing we can know exactly.

Often students get bogged down in the fact that they don't "understand" how and why radioactive elements decay and miss the whole point of this exercise.

The rate of decay (given the symbol λ) is the fraction of the 'parent' atoms that decay in unit time.

For geological purposes, this is taken as one year.




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In other words, artifacts found in the upper layers of a site will have been deposited more recently than those found in the lower layers.