Building Materials - Study Mode

Explanation

Solution: Gneiss is a type of rock that forms through a process of metamorphism. Let’s look at the options: Option A: Igneous rocks → Incorrect. Igneous rocks are formed from the cooling and solidification of molten material, such as magma or lava. Gneiss is not derived from igneous rocks. Option B: Metamorphic rocks → Correct. Gneiss is a metamorphic rock that is formed when granite or other rocks undergo high pressure and temperature, leading to the formation of distinct bands. Option C: Sedimentary rocks → Incorrect. Sedimentary rocks form from the deposition of materials over time, such as sand, silt, and clay. Gneiss does not come from sedimentary processes. Option D: Sedimentary metamorphic rocks → Incorrect. Gneiss is specifically a metamorphic rock, not a combination of sedimentary and metamorphic types. Therefore, the correct answer is Option B: Metamorphic rocks , as gneiss is derived from the metamorphism of other rocks, typically granite.