Which rock type forms from rocks fragments cemented together?

Which rock type forms from rocks fragments cemented together?

• A. Clastic
• B. Chemical
• C. Organic
• D. Metamorphic

Answer: (A)

Rocks formed from fragments cemented together are clastic sedimentary rocks. This happens when bits of other rocks—eroded by weathering—are deposited somewhere, then buried and compacted. Over time, minerals precipitate from groundwater to create a cement that binds the grains into a solid rock, producing examples like sandstone and conglomerate. The key idea is that the material is made of broken pieces of other rocks held together by cement, not by minerals dissolved in water, organic material, or new rock-forming changes due to heat and pressure. Chemical rocks form from minerals that precipitate from solution, organic rocks come from accumulated biological material, and metamorphic rocks arise from existing rocks transformed by heat and pressure.

Rocks formed from fragments cemented together are clastic sedimentary rocks. This happens when bits of other rocks—eroded by weathering—are deposited somewhere, then buried and compacted. Over time, minerals precipitate from groundwater to create a cement that binds the grains into a solid rock, producing examples like sandstone and conglomerate. The key idea is that the material is made of broken pieces of other rocks held together by cement, not by minerals dissolved in water, organic material, or new rock-forming changes due to heat and pressure.

Chemical rocks form from minerals that precipitate from solution, organic rocks come from accumulated biological material, and metamorphic rocks arise from existing rocks transformed by heat and pressure.