Explanation: The decline of frogs in a food chain is highly bad for an ecosystem, for one main reason because other species eat frogs and they won't have any frogs to eat. Therefore other species are forced to eat more of another as opposed to frogs, and if not then they might end up becoming extinct.
Both are igneous rocks, but whereas volcanic rocks are formed from cooling lava on the surface, plutonic rocks are formed from cooling magma below the surface. So plutonic rock is an igneous intrusive rock, while volcanic rock is extrusive.
