Burial practices are important in most cultures and religions because the loss of a loved one is something that we can all agree is momentous. Because of this, there have been discourses on the proper way to lay the dead to rest. For the longest time, it was even under speculation whether other forms of funerals were acceptable or if people could only be buried.
There have been many burial doctrines over the years, but these practices actually hold no water theologically as they were not founded on the Bible. The Bible does not prescribe any method for burials, and funerals were biblically carried out according to the customs of a place. (Even Jesus was buried in a tomb and not put in a coffin in the ground.)