According to your textbook, ammonia is one primary ingredient included in fertilizers for agricultural products throughout the United States as well as globally. Various fertilizers may be mixed with other chemicals to create a high explosive such as the one used against the Oklahoma Federal Building. How are those chemicals used to create a weapons of mass destruction, and how is access controlled by the federal government to diminish the probability of such attacks in the future?

Your response should be at least 200 words in length.