Although the proportion of cremation in Chinese mainland has reached about 53%, such people are mainly concentrated in urban areas. After people who have lived in rural areas for a long time die, they often choose more ancient burial methods, such as soil burial, tree burial and secondary burial. Funeral has formed different forms of folk customs in China, and funeral culture has been passed down from generation to generation.

There is no doubt that cremation can't involve the problem that the body turns into bones. When the corpse is put into a high-temperature cremator at hundreds or even thousands of degrees Celsius, the organs and other soft tissues of the corpse are oxidized in about two hours, and the remaining dry bone fragments are mostly calcium phosphate and some secondary minerals, accounting for only a few percent of the whole body mass.

If you have been to Seda, a place located in Ganzi Tibetan Autonomous Prefecture, you may see the whole process of this burial method with your own eyes as one of the tourists, because Seda's celestial burial platform is currently open to external tourists. Simply put, celestial burial means that the body after death is not buried directly, but let vultures swallow the body. The original intention was to give his life. Moreover, the way of celestial burial is not only chosen by Tibetans, such as Mongolians and Masai.

I believe that children who grew up in rural Sichuan like me will be familiar with burial, because many of us here will choose to put them in coffins and bury them in the soil after death. This kind of burial will certainly lead to the process of bones becoming bones. When I was a child, I shaved bones on the slope of the school playground. It is said that this used to be a graveyard before the school was founded. As for whether I planed human bones, I don't know, because the size is too small. So, after the death of such a body, how many teenagers will become a pile of bones?

The first experience after death is corpse cold.

According to scientific research, a person who died after being rescued is likely to hear the news that the doctor announced his death, because when the heart in the human body stops beating, but the brain does not die synchronously, the deceased will hear the information transmitted to the surrounding environment. After death, a person changes from a corpse to a pile of bones. The first change of the body is the cold corpse, because the body of the deceased cannot be metabolized.

Then, the corpse that only emits heat but can't produce body temperature will gradually cool down, and the cooling rate of body temperature will change from fast to slow, and finally it will be consistent with the ambient temperature, which is why the lower the ambient temperature of the deceased means the faster the original temperature of the corpse will be lost. On the whole, the cooling rate of corpses is not only related to external conditions such as clothing and environmental temperature, but also related to the age of the deceased, while the cooling rate of corpses of the elderly and children is generally relatively fast.

Although, under most natural conditions, the body temperature of the deceased will generally drop to a temperature close to the surrounding environment within 5 to 10 hours. But perhaps many people don't know that some people who die of special reasons will have a slow decline in body temperature, and even a short-term phenomenon of rising instead of falling. For example, people who die of carbon monoxide poisoning will have a slow cooling rate, while those who die of high fever and infectious diseases will have a short-term increase in body temperature.

The corpse gradually turned into bones in the slow process of corruption.

Although few people have seen bones, few people don't know that bodies will become fragmented bones after full corruption. I believe that people who are particularly interested in the history of human evolution have also seen many ancient human fossils in the online world. However, the essence of the corpse becoming a bone is inseparable from the decomposition of various soft tissue organs in the body by biological processes and the chemical processes with reduction and oxidation.

Whether a corpse is placed in a coffin or buried directly in the soil, it will gradually rot due to the bacteria in the surrounding environment. The most typical symptom of corpse corruption is that the skin will be covered with rotten blisters and green spots at the beginning. Usually, after the death time reaches more than 24 hours, the corpse will begin a long process of decomposition, and the degree of decomposition of the corpse mainly depends on the air flow, temperature and humidity conditions at the burial site.

Simply put, corpse corruption is the process of corpse destruction, and the end time of this process is when the corpse becomes only bones. As far as the propagation of spoilage bacteria is concerned, the rapid propagation of these bacteria can accelerate the decay process of the corpse if the environmental temperature of burying the corpse is between 25 and 30 degrees Celsius, but when the temperature is as high as 50 to 60 degrees Celsius or below 0 degrees Celsius, the decay process of the corpse will change or even stop, because spoilage bacteria are difficult to reproduce.

In short, when a corpse appears as a skeleton, it means that all the soft tissues of the deceased have completely dissolved and disappeared. As far as time is concerned, as long as a corpse is buried in the soil, it usually takes only two to three years to become a bone. However, as I said just now, the decomposition speed of the corpse is related to the surrounding environment. Therefore, if the soil is dry, the time required for bone decomposition may be extended to 7 to 8 years, which is the fundamental reason why corpses exposed to the wild are more likely to become a pile of bones in a shorter time.

In short, there is no definite answer to how long a person will become a pile of bones after death. Because this is the way to bury the body, the clothes worn by the deceased, the thickness and material of the coffin, whether there are animals that can damage the body, the characteristics of the soil in the burial site, the burial season, the temperature and humidity in the environment and so on. Friends who are particularly interested in this issue can read more detailed information and understand the process of corruption of the body.