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Half-life: Measurement of the time it takes for one-half of a radioactive substance to decay.

Relative dating methods are used to determine only if one sample is older or younger than another.The most widely used and accepted form of absolute dating is radioactive decay dating. Radioactive decay refers to the process in which a radioactive form of an element is converted into a nonradioactive product at a regular rate.The nucleus of every radioactive element (such as radium and uranium) spontaneously disintegrates over time, transforming itself into the nucleus of an atom of a different element.Cosmic rays: Invisible, high-energy particles that constantly bombard Earth from all directions in space.Dendrochronology: Also known as tree-ring dating, the science concerned with determining the age of trees by examining their growth rings.

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