Which rock type is formed by cemented layers of sediment?

Which rock type is formed by cemented layers of sediment?

• A. Igneous Rock
• B. Metamorphic Rock
• C. Sedimentary Rock
• D. Quarried Rock

Answer: (C)

The main idea here is how rocks form from loose sediment through lithification. When sediments settle out and accumulate in layers, those layers get buried over time. The weight compacts the particles (compaction), and minerals dissolved in groundwater precipitate to glue the grains together (cementation). This process turns loose sediment into solid rock, and the resulting rock is typically layered or bedded from the original deposition. That layering and cementing describe sedimentary rock, which forms specifically from cemented layers of sediment. Igneous rocks come from molten rock cooling and solidifying, while metamorphic rocks form when existing rocks are altered by heat and pressure. Quarried rock isn’t a rock type itself but rocks that are extracted from a quarry.

The main idea here is how rocks form from loose sediment through lithification. When sediments settle out and accumulate in layers, those layers get buried over time. The weight compacts the particles (compaction), and minerals dissolved in groundwater precipitate to glue the grains together (cementation). This process turns loose sediment into solid rock, and the resulting rock is typically layered or bedded from the original deposition.

That layering and cementing describe sedimentary rock, which forms specifically from cemented layers of sediment. Igneous rocks come from molten rock cooling and solidifying, while metamorphic rocks form when existing rocks are altered by heat and pressure. Quarried rock isn’t a rock type itself but rocks that are extracted from a quarry.