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2. Age disparity in sexual relationships - Wikipedia

   en.wikipedia.org/wiki/Age_disparity_in_sexual...

   e. In sexual relationships, concepts of age disparity, including what defines an age disparity, have developed over time and vary among societies. Differences in age preferences for mates can stem from partner availability, gender roles, and evolutionary mating strategies, and age preferences in sexual partners may vary cross-culturally.

3. K–Ar dating - Wikipedia

   en.wikipedia.org/wiki/K–Ar_dating

   K–Ar dating. Potassium–argon dating, abbreviated K–Ar dating, is a radiometric dating method used in geochronology and archaeology. It is based on measurement of the product of the radioactive decay of an isotope of potassium (K) into argon (Ar). Potassium is a common element found in many materials, such as feldspars, micas, clay ...

4. Absolute dating - Wikipedia

   en.wikipedia.org/wiki/Absolute_dating

   Absolute dating is the process of determining an age on a specified chronology in archaeology and geology. Some scientists prefer the terms chronometric or calendar dating, as use of the word "absolute" implies an unwarranted certainty of accuracy. [1] [2] Absolute dating provides a numerical age or range, in contrast with relative dating ...

5. Radiocarbon dating - Wikipedia

   en.wikipedia.org/wiki/Radiocarbon_dating

   Radiocarbon dating helped verify the authenticity of the Dead Sea scrolls. Radiocarbon dating (also referred to as carbon dating or carbon-14 dating) is a method for determining the age of an object containing organic material by using the properties of radiocarbon, a radioactive isotope of carbon . The method was developed in the late 1940s at ...

6. Dendrochronology - Wikipedia

   en.wikipedia.org/wiki/Dendrochronology

   The tree was over 500 years old when it was cut down in British Columbia in the 1890s. The markings indicating historical events were added in the 1920s. Dendrochronology (or tree-ring dating) is the scientific method of dating tree rings (also called growth rings) to the exact year they were formed in a tree.

7. Radiometric dating - Wikipedia

   en.wikipedia.org/wiki/Radiometric_dating

   The use of radiometric dating was first published in 1907 by Bertram Boltwood and is now the principal source of information about the absolute age of rocks and other geological features, including the age of fossilized life forms or the age of Earth itself, and can also be used to date a wide range of natural and man-made materials.