Dartz 2nd, its not that it reaches a certain quantity of heat per ounce and then kapowie, more like heat per ounce per unit of time, and that limit is pretty high, as in cutting torch at minimum. A chunk that gets loose will make a big cryogenic ice ball but isn't a bomb unless you drop it in a volcano, and uncontrolled atmospheric entry would do as well.
--
"Anko, what you do in your free time is your own choice. Use it wisely. And if you do not use it wisely, make sure you thoroughly enjoy whatever unwise thing you are doing." - HymnOfRagnorok as Orochimaru at SpaceBattles
woot Med. Eng., verb, 1st & 3rd pers. prsnt. sg. know, knows
--
"Anko, what you do in your free time is your own choice. Use it wisely. And if you do not use it wisely, make sure you thoroughly enjoy whatever unwise thing you are doing." - HymnOfRagnorok as Orochimaru at SpaceBattles
woot Med. Eng., verb, 1st & 3rd pers. prsnt. sg. know, knows