AFOQT Practice Test

Which type of rock is characterized by particles from other rocks or organic materials?

1. Metamorphic rock

2. Sedimentary rock

3. Igneous rock

4. Volcanic rock

The correct answer is: Sedimentary rock

The correct answer is sedimentary rock, which is formed from the accumulation and compaction of particles derived from pre-existing rocks, minerals, or organic materials. This type of rock often includes fragments from other rocks, such as sand, silt, and clay, as well as organic materials like shells or plant remains. Sedimentary rocks typically form in layers and often have a more varied texture compared to other rock types. They can provide valuable information about the Earth's history, as they may contain fossils and evidence of past environments. Understanding their formation process highlights how sediments contribute to the geological cycle and ecosystem over time. This composition is distinct from that of metamorphic and igneous rocks, which are formed through different geological processes.