Concept:Rocks formed from cooled and solidified molten magma are classified as igneous rocks.Explanation:Molten magma from beneath the Earth’s crust rises and cools.As it cools, it solidifies into hard rock.Rocks formed by this cooling and solidification process are called igneous rocks.The word “igneous” comes from “ignis”, meaning fire, because they form from hot molten material.Thus, option D correctly describes these rocks.Answer:D. igneous rocks