24 Dead zones are areas found in the oceans and
some large lakes where there is not enough
oxygen to support life. Algae blooms occur when
excess nutrients are introduced as pollutants
from fertilizers, sewage-treatment plants, and the
burning of fossil fuels. When the algae die and
undergo decay, bacteria rapidly use up the oxygen
in the area. Which human activity would most
likely result in a decrease in the size and number
of dead zones?