This type of rock can be classified into three groups, clastic, organic, and chemical.

• A. Clastic
• B. Metamorphic
• C. Sedimentary
• D. Igneous

Answer: (C)

Sedimentary rocks are classified into clastic, organic, and chemical based on how they form. Clastic sedimentary rocks come from fragments of preexisting rocks that were weathered, transported, deposited, and then cemented together; you can think of sandstone, mudstone (shale), and conglomerate as familiar examples. Organic sedimentary rocks form from the accumulation and lithification of plant or animal material, such as coal from plant debris or limestone formed largely from accumulated shell and coral remains. Chemical sedimentary rocks develop when dissolved minerals precipitate from water, often in evaporative environments, giving examples like rock salt and gypsum. This grouping helps distinguish sedimentary rocks from igneous and metamorphic rocks, which originate from cooling magma or from alteration under heat and pressure rather than from deposition and precipitation.