The reason the iconic molten steel scene works in Terminator 2: Judgement Day is because the lava is because destroying a robot made of nanotechnology seems almost impossible any other way. The plausibility of finding a vat of molten steel to push a sinister robot into, however, is another story. You would have to intentionally lead the robot towards a steel plant or volcano, two things that aren’t exactly a stone’s throw away at any given moment.
