Air pollution is best defined as . Group of answer choices small particles in the atmosphere arising from volatile organic compounds any gases in Earth's atmosphere in trace amounts suspended particles of gases that contain small amounts of solids and liquids gases or particles present in high enough concentrations in the atmosphere to harm humans, other organisms and structures

Why you put last one a? i think is b.

Your answer is d. silli hope this ! : ) i left an explanation down below if you need it: a sill forms when hot magma squeezes between layers of rock to form a hardened sheet of rock. a sill is basically a tabular sheet intrusion between old layers of sedimentary rock, volcanic beds, or in the direction of foliation inherent in metamorphic rock. the word sill means a concordant intrusive sheet.