Final answer:
Bedded gypsum and halite are evaporites and chemical sedimentary rocks, formed from the chemical precipitation of minerals left behind when water that contains dissolved ions evaporates.
Step-by-step explanation:
Bedded gypsum and halite are best described as evaporites; chemical sedimentary rocks. These minerals are formed from the precipitation of chemical constituents that are left behind when water evaporates. Unlike detrital sedimentary rocks, which are composed of weathered rock fragments, or organic sedimentary rocks like coal and peat, which are formed from accumulated organic debris, evaporites like gypsum and halite form from the chemical precipitation from a concentrated water solution when it becomes oversaturated due to evaporation. Thus, they are a specific type of sedimentary rock that results from the evaporation of water containing dissolved mineral ions.
Answer: D) evaporites; chemical sedimentary rocks