Correct option is D
- Rhyolite is a type of igneous rock that forms from the rapid cooling of high-silica lava erupted from volcanoes.
- It is a fine-grained, light-colored rock typically found in continental volcanic regions and is the extrusive equivalent of granite.
- Rhyolite is composed mainly of quartz, feldspar, and minor amounts of mica or amphibole, giving it a silica-rich composition.
Additional Information
Igneous rocks are formed through the cooling and solidification of magma or lava.
- Intrusive igneous rocks (e.g., granite) form below the Earth's surface.
- Extrusive igneous rocks (e.g., rhyolite) form on the Earth's surface.
Rhyolite is used in construction and sometimes as a decorative stone. Its high silica content makes it prone to fracturing, which can also produce sharp-edged fragments used in tools by early humans.
Other Options
- Breccia: Incorrect. Breccia is a sedimentary rock composed of angular rock fragments cemented together.
- Chert: Incorrect. Chert is a sedimentary rock formed from microcrystalline quartz, typically from the accumulation of silica from biological or chemical processes.
- Conglomerate: Incorrect. Conglomerate is another sedimentary rock, composed of rounded rock fragments cemented together by finer materials.
