This article is about death in the different cultures around the world as well as ethical issues relating to death, such as martyrdom, suicide and euthanasia. Death refers to the permanent termination of life-sustaining processes in an organism, i.e. when all biological systems of a human being cease to operate. Death and its spiritual ramifications are debated in every manner all over the world. Most civilizations dispose of their dead with rituals developed through spiritual traditions.
In most cultures, after the last offices have been performed and before the onset of significant decay, relations or friends arrange ritual disposal of the body, usually either cremation or interment in a tomb. Cremation is a very old and quite common custom. For some people, the act of cremation exemplifies the belief of the Christian concept of "ashes to ashes". Other modes of disposal include interment in a grave, or interment of the body in a sarcophagus, crypt, sepulchre, or ossuary, a mound or barrow, or a monumental surface structure such as a mausoleum (exemplified by the Taj Mahal) or a pyramid (as exemplified by the Great Pyramid of Giza).
One method of corpse disposal is sky burial, which involves placing the body of the deceased on high ground (a mountain) and leaving it for birds of prey to dispose of, as in Tibet. In some religious views, birds of prey are carriers of the soul to the heavens. Such practice may also have originated from pragmatic environmental issues, such as conditions in which the terrain (as in Tibet) is too stony or hard to dig, or in which there are few trees around to burn. As the local religion of Buddhism, in the case of Tibet, believes that the body after death is only an empty shell, there are more practical ways than burial of disposing of a body, such as leaving it for animals to consume.