The advantage of using the scientific method is that a: it's cautious building of evidence-based understanding is dependable and logical. b: it's random way of trying everything covers all options c: any evidence in disagreement with a theory can be thrown out. d: continual testing leads to mistakes being made.

what is the actual question though?

igneous rocks also form where plates converge. the subducting plate melts as it sinks into the crust of the earth, and the melt rises into the overriding plate forming volcanoes. metamorphic rocks are formed mainly in the lithosphere, wherever there is high pressure and high temperature. -woods