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Although the term 'ashes' is often used to describe cremated remains, what is left after cremation is not ashes. the cremation process does not actually burn the body and reduce it to ashes like a fire when it burns wood.

The thought of a long and slow decomposition process is unappealing to some; many people find that they prefer cremation because it disposes of the body instantly. other people view cremation as a way of simplifying their funeral process. cremation is a more simple disposition method to plan than a burial funeral.

They didn't. However, extreme heat does make bone very fragile, and a burning skull can shatter if something falls on it. In the aftermath of a house fire, this might make it look as if someone's skull has exploded. But no, skulls don't explode in the crematorium.