1) A small portion of gases that cause acid rain come from _____ sources, such as volcanoes. a) natural b) fuels c) fossils d) dirt 2) Most of the gases that cause acid rain come from ______. a) water b) fossil fuels c) natural sources d) dirt 3) How is acid rain formed? a) Carbon monoxide and carbon dioxide mix with water in the ocean. b) Sulfur dioxide and carbon monoxide mix with lake water. c) Carbon dioxide and oxygen mix with water in the air. d) Sulfur dioxide and nitrogen oxide mix with water in the air. 4) What are the two types of acids that are in acid rain? a) Iron and sulfur b) nitric and sulfuric c) nitrogen dioxide and sulfur dioxide d) all the above

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