The dead zones in the Gulf of Mexico which are uninhabitable to marine organisms is mainly due to
a. global warming.
b. dumping of nuclear waste.
c. fertilizer runoff from agricultural land.
d. acid rain.
Question 2
The main concern about dumping computers in landfills comes from
a. depletion of space in the landfill.
b. contamination from hazardous substances.
c. waste of economic resources.
d. inequality of access to new technology.