Which situation is an example of new efforts to prevent the tragedy of the commons? 

A)  converting land from private to more public ownership 
B)  using common-property resources at or above their sustainable yields 
C)  moving from a taxpayer-pay approach to a user-pay approach 
D)  moving from a user-pay approach to a taxpayer-pay approach

If a well has a cone of depression associated with it because of overpumping of the groundwater, what is a possible consequence?

A) Groundwater, which may contain pollutants, will flow toward the cone of depression and cause a polluted well.
B) Groundwater, which may contain pollutants, will flow away from the cone of depression and the well will be safe from pollution.
C) Any pollutants in the flowing groundwater will be filtered out before reaching the cone of depression.

Which of the following processes is NOT considered physical weathering?

A) near-surface fracturing
B) frost wedging
C) prying by plant roots
D) thermal expansion
E) oxidation

The _________________________ school believes the best way to manage the planet for human benefit is through an open,global economy with minimal government interference.

On what factor does correspondence between climate models and the real world depend? 

A)  on the design and assumptions of the model 
B)  on organization 
C)  on qualifications of data entry personnel 
D)  on positive feedback

____________________ is the Canadian author,environmental activist,and spokesperson who has focused her attention on the world's water crisis.

The Mediterranean Sea is connected with the Atlantic Ocean through the:

A) Strait of Gibraltar
B) Red Sea
C) Nile River
D) Black Sea

Which pair of energy sources are among those primarily responsible for Earth's external geological processes? 

A)  energy from gravity and magnetism 
B)  energy from the sun and heat from Earth's interior 
C)  energy from the sun and magnetism 
D)  energy from the sun and gravity

____________________ pollution can affect various plant and animal species,such as sea turtles.

Which substance is the fissionable fraction of the fuel in a nuclear reactor? 

A)  deuterium 
B)  uranium-235 
C)  plutonium-235 
D)  hydrogen