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The protocols and practices of dating, and the terms used to describe it, vary considerably from country to country and over time.
While the term has several meanings, the most frequent usage refers to two or more people exploring whether they are romantically or sexually compatible by participating in dates with the other.
Dating as an institution is a relatively recent phenomenon which has mainly emerged in the last few centuries.
From the standpoint of anthropology and sociology, dating is linked with other institutions such as marriage and the family which have also been changing rapidly and which have been subject to many forces, including advances in technology and medicine.
It can be a form of courtship consisting of social activities done by the couple.
In addition the following techniques are outlined: potassium-argon dating, uranium series dating (including ionium dating), fission track dating and dating by chemical change (including hydration of obsidian and weathering layers on glass).
Some mention of dendrochronology and varve chronology is included in the section on radiocarbon.
Possible causes for these fluctuations are past variations in climate, in sunspot activity and in geomagnetic field intensity.
There is evidence from archaeomagnetic studies that the latter has been significantly different from its present day value, possibly varying sinusoidally with a maximum about 2000 years ago and a minimum about 6000 years ago.