The correct option is B. igneous. Explanation of the Correct Answer Igneous Rocks: These are the types of rocks that are formed from molten magma or lava. When magma from beneath the Earth's surface cools and solidifies, it forms igneous rock. This process can occur either below the surface (intrusive igneous rocks) or on the surface after a volcanic eruption (extrusive igneous rocks).

1. Formation Process:
2. Magma: This is molten rock found beneath the Earth's surface. When it rises to the surface and erupts as lava, it cools and solidifies to form igneous rocks.
3. Cooling Rate: The rate at which the magma cools affects the texture of the igneous rock. Slow cooling (beneath the surface) leads to larger crystals (e.g., granite), while rapid cooling (on the surface) results in smaller crystals (e.g., basalt).
4. Types of Igneous Rocks:
5. Intrusive Igneous Rocks: Formed from magma that cools slowly underground. Example: Granite.
6. Extrusive Igneous Rocks: Formed from lava that cools quickly on the surface. Example: Basalt.

Why the Other Options Are Incorrect A. Sedimentary: - Sedimentary rocks are formed from the accumulation and compaction of mineral and organic particles. They often form in layers and can include fossils. Examples include sandstone and limestone. Since sedimentary rocks do not originate from molten material, this option is incorrect. C. Metamorphic: - Metamorphic rocks are formed from existing rocks (igneous, sedimentary, or other metamorphic rocks) that undergo a transformation due to heat, pressure, or chemically active fluids. This process is called metamorphism. Examples include schist and marble. Since metamorphic rocks do not originate from molten magma, this option is also incorrect. D. Schist: - Schist is a specific type of metamorphic rock characterized by its foliated texture and is formed from the metamorphism of shale or other sedimentary rocks. Like the previous options, schist does not originate from molten magma, making this option incorrect as well. Summary of Key Points

• Igneous rocks are formed from the cooling and solidification of molten magma or lava.
• They can be classified into intrusive (formed underground) and extrusive (formed on the surface).
• Sedimentary and metamorphic rocks are formed through different processes and do not originate from molten material.
• Understanding the rock cycle is crucial for distinguishing between these rock types.

Revision Summary

• Igneous rocks are formed from molten magma or lava.
• They can be classified as intrusive or extrusive based on their formation location.
• Sedimentary rocks form from particle accumulation, while metamorphic rocks arise from existing rocks undergoing transformation.
• Schist is a type of metamorphic rock, not igneous.