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The spontaneous transformation of an unstable atomic nucleus into a lighter.

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It is a technique for determining the age of organic materials, such as wood, based on their content of the radioisotope

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It is a method of dating geological or archeological specimens by determining the relative proportions of particular radioactive isotopes present in a sample.

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Half-Life is a series of first-person shooter games developed and published by Valve. The major installments feature protagonist Gordon Freeman.

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A fossil is any preserved remains, impression, or trace of any once-living thing from a past geological age.

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The Rock Cycle is a group of changes. Rocks are the most common material on Earth. They are naturally occurring aggregates of one or more minerals.

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The sub-discipline of geology that involves study of rock strata is called stratigraphy. Layering of rocks or sediment is also called stratification.

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The geologic time scale is a system of chronological dating that relates geological strata to time.