Decomposition starts almost immediately after death, with the end of normal bodily functions and the spread of internal bacteria. These processes cause the tissues of the human body to rupture and break down. ... Once the soft tissues have fully decomposed, all that remains is the skeleton.

Why are skeletal remains present long after death?

For the most part skeletal remains are found long after a victim has died and this may be because the body has been disposed of in order to cover up the perpetration of a crime. ... A body buried in a peat bog for example may be perfectly preserved upon exhumation as has been the case for many cadavers of pre-historic man.

How long does it take for a body to decompose to bones in a coffin?

But within a year all that is usually left is the skeleton and teeth, with traces of the tissues on them - it takes 40 to 50 years for the bones to become dry and brittle in a coffin.