What is the color of a star (a) with B magnitude of 8.122 and a V magnitude of 8.284?
(b) with B magnitude of 2.364 and a V magnitude of -0.593?
(c) with B magnitude of 7.495 and a V magnitude of 5.831?

positive reinforcement? ?

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