Which statement best describes an igneous intrusion? a. magma explodes to the surface and forms a smooth outer layer of rock. b. igneous intrusions form when ice crystals splash into lava. c. magma is injected into surrounding rock forming an igneous intrusion. d. magma is exported to an open area and forms iron.

C. Magma is injected into surrounding rock forming an igneous intrusion.

Igneous intrusion is a natural phenomena in which a molten magma rises up from the mantle and intrude inside the rocks lying above it. The hot magma gets cool inside the another rock, therefore, the structure of the rock being intruded by magma remains stable and unbroken.

i'd say that the moon rock is about 2.2 billion years old.