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The geologic time scale is a system of chronological dating that relates geological strata  to time. It is used by geologists, paleontologists, and other Earth scientists to describe the timing and relationships of events that have occurred during Earth's history.

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The best estimate for Earth's age is based on radiometric dating of fragments from the Canyon Diablo iron meteorite. From the fragments, scientists calculated the relative abundances of elements that formed as radioactive uranium decayed over billions of years

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Radioactive Decay

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the determination of the age of objects of organic origin by measurement of the radioactivity of their carbon content.

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Radiometric datingany method of determining the age of earth materials or objects of organic origin based on measurement of either short-lived radioactive elements or the amount of a long-lived radioactive element plus its decay product

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Radiometric datingany method of determining the age of earth materials or objects of organic origin based on measurement of either short-lived radioactive elements or the amount of a long-lived radioactive element plus its decay product

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the time required for one half the atoms of a given amount of a radioactive substance to disintegrate.

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The history of Earth concerns the development of planet Earth from its formation to the present day. Nearly all branches of natural science have contributed to the understanding of the main events of Earth's past. ... Earthformed around 4.54 billion years ago by accretion from the solar nebula.

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any remains, impression, or trace of a living thing of a former geologic age, as a skeleton, footprint, etc.

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a continuous process by which rocks are created, changed from one form to another, destroyed, and then formed again.

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furnished with a rostrum.