Which rock type forms from the cooling and solidification of molten material?

Which rock type forms from the cooling and solidification of molten material?

• A. Igneous Rock
• B. Sedimentary Rock
• C. Metamorphic Rock
• D. Magma

Answer: (A)

Igneous rocks form from the cooling and solidification of molten material. When magma deep underground cools, it crystallizes into coarse-grained rocks like granite; when lava erupts onto the surface and cools rapidly, it becomes fine-grained rocks like basalt or even glassy obsidian. The texture and mineral makeup of igneous rocks are controlled by how quickly the molten material cools. In contrast, sedimentary rocks come from sediments that settle and are cemented together, and metamorphic rocks come from existing rocks transformed by heat and pressure without melting. Magma is the molten material itself, not a rock, and it is the source of igneous rocks.

Igneous rocks form from the cooling and solidification of molten material. When magma deep underground cools, it crystallizes into coarse-grained rocks like granite; when lava erupts onto the surface and cools rapidly, it becomes fine-grained rocks like basalt or even glassy obsidian. The texture and mineral makeup of igneous rocks are controlled by how quickly the molten material cools. In contrast, sedimentary rocks come from sediments that settle and are cemented together, and metamorphic rocks come from existing rocks transformed by heat and pressure without melting. Magma is the molten material itself, not a rock, and it is the source of igneous rocks.