Aluminium corrosion resistance. Aluminium corrosion resistance is very good in untreated aluminium. Untreated aluminium has very good corrosion resistance in most environments. This is primarily because aluminium spontaneously forms a thin but effective oxide layer that prevents further oxidation.
Human body is just the medium for soul to survive on earth. Soul wears human body for its learning on earth. Soul can not experience feelings in its original form and therefore it needs a human body. Now when a human body dies, a soul leaves that body and return to its original form. Sometimes, in case of sudden accident, a person dies and soul returns to its original form.
How does a body decompose in a casket? I found this great video linked in an answer to another question on Quora: Quora User's answer to What's the last part of your body to decay when you die? But it didn't address the curiosity I have about the body in the casket.