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The bombardment of planetary and satellite surfaces by debris left over from...

Atomic nuclei of a radioactive element decay spontaneously, producing other elements and isotopes until a stable species is formed.

The ability to quantify the geologic time scale—i.e., to date the events of the geologic past in terms of numbers of years—is largely a result of coupling radiometric dating techniques with older, classical methods of establishing relative geologic ages. ...water of the Nubian sandstone aquifer, which extends through several countries in an area that is now the Sahara desert.

The water is being used extensively for water supply and irrigation purposes.

The early studies of the radioactive decay of uranium and thorium into lead caused the British physicist Ernest Rutherford to suggest that this process could be used to determine the age of rocks and consequently of the Earth by observing the amount of helium retained by a rock relative to its uranium and thorium contents.

Mass spectrometers capable of measuring isotopic ratios allow the...

The igneous activity that produced such intrusions...

...calculation was based on the assumption that the substance of the Earth is inert and thus incapable of producing new heat.

radioactive or radiometric dating-53radioactive or radiometric dating-82radioactive or radiometric dating-38radioactive or radiometric dating-1

Radioactive elements in the Earth, the Moon, and in meteorites can provide useful information about the ages of these objects and about the dates of formation of the heavy elements themselves.

His estimate came into question after the discovery of naturally occurring radioactivity by the French physicist Henri Becquerel in 1896 and the subsequent recognition by his colleagues, Marie and Pierre Curie, that compounds of radium (which occur in uranium minerals)...

Another role of isotopic geochemistry that is of great importance in geology is radiometric age dating. Beginning with studies in the 1950s, a much better chronology and record of Pleistocene climatic events have evolved through analyses of deep-sea sediments, particularly from the oxygen isotope record of the shells of microorganisms that lived in the oceans.

Scientific knowledge of Earth’s geologic history has advanced significantly since the development of radiometric dating, a method of age determination based on the principle that radioactive atoms in geologic materials decay at constant, known rates to daughter atoms.

Radiometric dating has provided not only a means of numerically quantifying geologic time but also a tool for determining the...

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