Which rock type forms when magma cools and solidifies?

Which rock type forms when magma cools and solidifies?

• A. Igneous rock
• B. Metamorphic rock
• C. Sedimentary rock
• D. Core

Answer: (A)

Molten rock that cools and solidifies becomes igneous rock. When magma stays underground and cools slowly, it forms coarse-grained rocks like granite because crystals have time to grow. If lava erupts onto the surface and cools quickly, it creates fine-grained rocks such as basalt or a glassy texture like obsidian. This cooling-and-solidification process is what defines igneous rocks. Metamorphic rocks come from existing rocks altered by heat and pressure, not by cooling magma, and sedimentary rocks form from particles that are weathered, deposited, and cemented together. Core isn’t a rock type.

Molten rock that cools and solidifies becomes igneous rock. When magma stays underground and cools slowly, it forms coarse-grained rocks like granite because crystals have time to grow. If lava erupts onto the surface and cools quickly, it creates fine-grained rocks such as basalt or a glassy texture like obsidian. This cooling-and-solidification process is what defines igneous rocks. Metamorphic rocks come from existing rocks altered by heat and pressure, not by cooling magma, and sedimentary rocks form from particles that are weathered, deposited, and cemented together. Core isn’t a rock type.