Which of the following is an example of igneous rock?

Correct option is D

The correct answer is (d) Rhyolite. Rhyolite is a fine-grained, extrusive igneous rock formed from the rapid cooling of high-silica magma. It is composed primarily of quartz, feldspar, and biotite, with a texture ranging from aphanitic to porphyritic. Its extrusive nature is due to volcanic activity where the molten rock solidifies quickly upon reaching the Earth's surface, resulting in fine-grained textures.
Information Booster:

● Igneous rocks are formed from the solidification of molten magma or lava, and they can be intrusive (plutonic) or extrusive (volcanic).

● Rhyolite is chemically equivalent to granite but forms at the surface, whereas granite forms deep underground. ● Common colors of rhyolite include white, light gray, and pink, depending on its mineral composition.

● It is commonly found in volcanic arcs and regions with significant volcanic activity.

● Rhyolite is rich in silica (SiO₂), making it a felsic rock.

Additional Knowledge:
· Breccia (Option A): Breccia is a sedimentary rock composed of angular fragments of other rocks cemented together.
· Chert (Option B): Chert is a microcrystalline sedimentary rock made primarily of silica.
· Conglomerate (Option C): Conglomerate is a sedimentary rock consisting of rounded rock fragments cemented together.
· Rhyolite (Correct Answer): An igneous rock, it forms from high-silica magma and is often associated with explosive volcanic eruptions.