http://www.ns.ec.gc.ca/aeb/ssd/acid/acidfaq.html Environment Canada's acid rain site. Read through the description. How is the acidity of normal rainwater described? From the textbook, what is the principal cause of acidity of normal rainwater? What are the sources of most of the nitrogen oxides that contribute to acid rain? Besides nitrogen oxides, what other pollutants contribute to acid rain? What is the estimated dollar amount of damage annually to Canada from acid rain?

http://soils.ag.uidaho.edu/soilorders/ The twelve soil orders. The URL given in the textbook has been changed to the above. Go to "Mollisols." What are mollisols? In which region of the United States are they most extensive?