Where do sedimentary rocks form?

• A. In riverbeds, lakes, oceans, and deserts where sediments accumulate.
• B. Only in magma chambers.
• C. Only at high-grade metamorphic zones.
• D. Only within volcanic vents.

Answer: (A)

Sedimentary rocks form when particles produced by weathering and erosion—like sand, silt, clay, and organic debris—are deposited in layers, later buried, compacted, and cemented together. This lithification happens wherever such sediments settle and accumulate over time, which includes riverbeds, lakes, oceans, and deserts.

Magma chambers produce igneous rocks as molten rock cools and solidifies, not from accumulating sediments. High-grade metamorphic zones involve rocks changing form under heat and pressure, not simple sediment deposition. Volcanic vents eject magma and volcanic material, leading to igneous or pyroclastic rocks rather than typical sedimentary deposits.