It is most important for locating archaeological sites before destruction of the landscape through building, road construction, or modern agricultural practices.When viewed from the air, sites may be revealed as crop marks, soil marks, .For example, the plan of a site, ditches, walls, pits, etc.can be reflected in the way the crops grew (crop marks) or a pattern of dark occupation soil may show against a lighter topsoil or stone from walls may be just under the surface (soil marks).
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Jones, NUS As countries in Asia go through difficult demographic transitions, marriage patterns have never been more important.
Asia was traditionally characterised by universal marriage — defined as when fewer than 5 per cent of women have not married by the age of 50.
But this is no longer the case: over recent decades countries in East and Southeast Asia have seen the demise of universal marriage, and this has directly contributed to declines in fertility in many countries to ultra-low levels because there is almost no childbearing outside marriage.
Yet in other parts of Asia, especially in South Asia, it is not the failure of people to marry that is of concern but the persistence of high levels of teenage marriage, much of it occurring below the legal minimum age.