Final answer:
The false statement about magma is that it solidifies below the Earth's surface to form extrusive igneous rocks; in fact, it forms intrusive igneous rocks. Extrusive rocks are created from lava that cools rapidly on the surface, leading to a fine-grained texture. Option number c is answer.
Step-by-step explanation:
The false statement about magma is: C. Magma which solidifies below the surface forms extrusive igneous rocks. Extrusive igneous rocks are formed from lava that cools on the Earth's surface. Instead, when magma cools and solidifies below the Earth's surface, it forms intrusive igneous rocks like granite, which are coarse-grained due to the slow cooling process allowing for large crystal formation.
Igneous rocks can be classified based on texture and mineral composition, determined by the magma's cooling rate and chemistry. Fast cooling magma results in fine-grained extrusive igneous rocks, while slow cooling forms coarse-grained intrusive igneous rocks.
Additionally, most magmas are of molten silicate minerals, magma is indeed less dense than the solid rock from which it forms, and it comprises liquid rock, gases, and crystals.