Walter and Luis Alvarez hypothesized that an asteroid impact caused the formation of a 66- million-year-old layer of clay containing high levels of iridium. How did geologists test this hypothesis? What evidence did they look for?

Ammonium perchlorate nh4clo4 is the solid rocket fuel used by the u.s. space shuttle. it reacts with itself to produce nitrogen gas n2 , chlorine gas cl2 , oxygen gas o2 , water h2o , and a great deal of energy. what mass of nitrogen gas is produced by the reaction of 2.1g of ammonium perchlorate?