A certain biome is characterized by sedges, forbs, grasses, low-growing shrubs, lichens, and mosses. Its growing season is short, but summer days are very long. Although precipitation is low, the soil is often wet. Alternate freezing and thawing of soil results in a pattern of polygons and pingos on the soil surface. This biome is most likely

sulfur dioxide

explanation: acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. these substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.

chert is a sedimentary rock composed of microcrystalline or cryptocrystalline silica. with this little bit of information, you can come to the conclusion that your answer is c.  

explanation: