well diabolic means inderstructible i think so i think a rock can be broken by a hammer of some sort so it is not diabolic
ps i also answeared dieabetas
The density of rock B is greater because its volume is less.
By heat and pressure
No. A similar rock could be formed, but some characteristics would be altered.
Almost all rocks will undergo change at one point. So the answer is yes. metamorphic rock can undergo melting, becoming magma, when surfacing and cooling will become igneous rocks. Metamorphic rock...
Petroleum isn't actually rock. It is found in sedimentary rock