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The age of the Earth is approximately 4.54 ± 0.05 billion years.  This dating is based on evidence from radiometric age-dating of meteorite material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.

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The process by which an unstable atomic nucleus loses energy by emitting radiation.

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A method for determining the age of an object containing organic material by using the properties of radiocarbon, a radioactive isotope of carbon

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A technique used to date materials such as rocks or carbon, in which trace radioactive impurities were selectively incorporated when they were formed.

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A group of changes. Different types of can change into other types of rocks. For example, igneous rocks turn into sedimentary rocks.

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The history of Earth concerns the development of planet Earth from its formation to the present day. Earth formed around 4.54 billion years ago by accretion from the solar nebula.

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The remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock.

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The time taken for the radioactivity of a specified isotope to fall to half its original value.

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A layer of sedimentary or igneous rock that were formed at the Earth's surface with different characteristics of different layers.

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The geologic time scale (GTS) is a system of chronological dating that relates geological strata (stratigraphy) 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.