Which statement best describes an igneous intrusion?
A. Magma explodes to the surface and forms a smooth outer layer of rock.B. Magma is exported to an open area and forms iron.C. Igneous intrusions form when ice crystals splash into lava.D. Magma is injected into surrounding rock forming an igneous intrusion.
D. Magma is injected into surrounding rock forming an igneous intrusion.
Igneous intrusion forms when magma from under the surface of the earth is slowly pushed up to occupy spaces or cracks found among rocks and cools down and solidifies before it reaches the surface of the earth.