Which term is a rock formed from cooling magma?

Which term is a rock formed from cooling magma?

• A. Igneous rock
• B. Inert gas
• C. Infiltration
• D. Herbicide

Answer: (A)

When molten rock from inside the Earth cools and solidifies, it becomes igneous rock. This happens as magma rises or erupts to the surface and then cools, either slowly underground to form larger crystals or quickly on the surface to form fine-grained rock. The defining idea is that igneous rocks originate from cooling magma. The other options describe things that aren’t rocks formed this way: inert gas is simply a nonreactive gas, infiltration is a process of water seeping into soil, and a herbicide is a chemical used to kill weeds.

When molten rock from inside the Earth cools and solidifies, it becomes igneous rock. This happens as magma rises or erupts to the surface and then cools, either slowly underground to form larger crystals or quickly on the surface to form fine-grained rock. The defining idea is that igneous rocks originate from cooling magma. The other options describe things that aren’t rocks formed this way: inert gas is simply a nonreactive gas, infiltration is a process of water seeping into soil, and a herbicide is a chemical used to kill weeds.