- The largest contaminant (by weight and volume) of inland surface waters
such as lakes, rivers, and streams in the United States is (A) sediment
(B) organic wastes
(C) pathogenic organisms
(D) heavy metals
(E) oil - Currently, the United States recycles about what percentage of the
municipal solid waste it generates?
(A) 3%
(B) 15%
(C) 35%
(D) 50%
(E) 75%Questions 67–69 refer to the following diagram of a heavy-water moderated
nuclear reactor.