(B) SO 2
(C) CO 2
(D) O 3
(E) Pb
- The diagram below shows the range of organisms found within certain
sections of a river in an industrial area. Which section of the river most
likely has the LOWEST level of dissolved oxygen?
(A) Clean zone
(B) Decomposition zone
(C) Septic zone
(D) Recovery zone
(E) None of the above
- Biochemical oxygen demand is created by which type of pollution?
(A) Toxic chemical
(B) Organic matter
(C) Thermal pollution
(D) Too much oxygen in the water
(E) Choices B and C
- The major source of solid waste in the United States is
(A) homes
