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The age of the Earth is approximately 4.54 ± 0.05 billion years (4.54 × 10⁹ years ± 1%).[1][2][3][4] This dating is based on evidence from radiometric age-dating of meteorite[5] material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.

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Radioactive decay (also known as nuclear decay orradioactivity) is the process by which an unstable atomic nucleus loses energy (in terms of mass in its rest frame) by emitting radiation, such as an alpha particle, beta particle with neutrino or only a neutrino in the case of electron capture, gamma ray, or electron ...

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is a method for determining the age of an object containing organic material by using the properties of radiocarbon (14
C), a radioactive isotope of carbon.

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

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is the time required for a quantity to reduce to half its initial value. The term is commonly used in nuclear physics to describe how quickly unstable atoms undergo, or how long stable atoms survive, radioactive decay.

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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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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. Igneous rockcan change into sedimentary rock or into metamorphicrock. Sedimentary rock can change into metamorphicrock or into igneous rock. Metamorphic rock can change into igneous or sedimentary rock. Igneous rockforms when magma cools and makes crystals.

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The term rock strata refers to stacked-up layers of sedimentary rock.

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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.