This process also depends on the relative temperatures of different years, which allows comparison with paleoclimatic data.

Thus, each annual layer starts 18O rich, becomes 18O poor, and ends up 18O rich.

By comparing the ratios of these isotopes to their nonradioactive counterparts (i.e.The example used here contrasts sharply with the way conventional scientific dating methods are characterized by some critics (for example, refer to discussion in "Common Creationist Criticisms of Mainstream Dating Methods" in the Age of the Earth FAQ and Isochron Dating FAQ).A common form of criticism is to cite geologically complicated situations where the application of radiometric dating is very challenging.These are often characterised as the norm, rather than the exception.I thought it would be useful to present an example where the geology is simple, and unsurprisingly, the method does work well, to show the quality of data that would have to be invalidated before a major revision of the geologic time scale could be accepted by conventional scientists.Carolyn Bradshaw from James Madison University in Virginia, US, and colleagues explored the reasons that motivate college men and women to hook up or to date, as well as the perceived relative benefits and costs of the two practices. Typically, dating follows a predictable pattern whereby the man is active − he asks the woman to go out with him, organizes the date and at the end of it may initiate sexual activity; whereas the woman is reactive − she waits to be asked out on a date and accepts or rejects the man's sexual overtures.They know each other or want to get to know one another and there is the prospect of a future relationship.