It's your decision
Disposition is the term used by the funeral profession to describe the final handling of the deceased's remains.
Although your initial decision for the disposition of the body is between burial and cremation, there are several variations on each.
Whichever choice you make, the body will eventually return to its natural elements.
If the body is buried...
1. It can be interred (earth burial).
2. It can be entombed in a crypt within a mausoleum (above-ground burial).
3. It can be buried at sea.