The correct option is C. Igneous Rock. Explanation of the Correct Answer Igneous Rock Formation: Igneous rocks are formed from the cooling and solidification of molten rock material known as magma (when it is beneath the Earth's surface) or lava (when it erupts onto the surface). The process can occur in two main environments:

1. Intrusive Igneous Rocks: These rocks form when magma cools slowly beneath the Earth's surface. Because the cooling process is slow, large crystals can form. An example of an intrusive igneous rock is granite.
2. Extrusive Igneous Rocks: These rocks form when lava cools quickly on the Earth's surface. The rapid cooling results in smaller crystals. An example of an extrusive igneous rock is basalt.

Why Other Options Are Incorrect A. Sedimentary Rock: - Sedimentary rocks are formed from the accumulation and compaction of mineral and organic particles, or from the precipitation of minerals from water. They often form in layers and can contain fossils. Examples include sandstone and limestone. Since sedimentary rocks do not form from magma or lava, this option is incorrect. B. Metamorphic Rock: - Metamorphic rocks are formed from existing rocks (either igneous, sedimentary, or other metamorphic rocks) that undergo a transformation due to high pressure, high temperature, or chemically active fluids. This process is called metamorphism. Examples include schist and marble. Since metamorphic rocks do not originate from the cooling of magma or lava, this option is also incorrect. D. Fossil Rock: - The term "fossil rock" is not a standard classification in geology. It may refer to sedimentary rocks that contain fossils, but it does not represent a distinct type of rock formation. Therefore, this option is not applicable in the context of rock types formed from magma or lava. Summary of Key Points

• Igneous rocks are formed from the cooling and solidification of magma or lava.
• They can be classified into intrusive (cooling below the surface) and extrusive (cooling on the surface).
• Sedimentary rocks form from particle accumulation, while metamorphic rocks arise from the transformation of existing rocks.
• The term fossil rock is not a recognized geological classification.

Revision Summary

• Igneous rocks are formed from the cooling of magma or lava.
• Intrusive igneous rocks cool slowly and have larger crystals; extrusive rocks cool quickly and have smaller crystals.
• Sedimentary rocks form from particle accumulation, and metamorphic rocks result from the transformation of existing rocks.
• "Fossil rock" is not a standard geological term and does not refer to a specific rock type.