The dead zone in the Gulf of Mexico is primarily the result of
A) nonpoint sources of pollutants.
B) point sources of pollutants.
C) a natural cycle related to cold ocean currents.
D) industrial pollution by oil refineries in the New Orleans region.
Question 2
Small subsistence farms in developing nations
A) had a sustainable use of the environment when populations were smaller than now.
B) have mostly depleted the natural environment, making farming no longer possible.
C) can support the developing populations at up to 10 times their current population size.
D) have polluted rivers and streams and destroyed surrounding forests.
Charles Darwin may be dead and gone but a recent write-in campaign has pitted him against Republican
Sources and Amounts of Oil Released into North American Marine Waters
The low-elevation coastal zone in Bangladesh is under threat of inundation by 2100
Kidney beans, steak, and iron-fortified bread and cereal are good sources of iron
The Danger Zone
Possible Sources of Differences in Output per Worker