The economic value of biodiversity and ecosystems services is difficult to assess because
A. nobody has studied them.
B. we only recognize their value when they are gone.
C. we don't directly pay for them.
D. All of the statements are correct.
Answer: C
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The HROV ____________, the deepest-diving vehicle now in operation, reached the bottom of the world's deepest
ocean trench at a depth of 10,902 meters. Fill in the blank(s) with the appropriate word(s).
Industrial pollution from an oil refinery best represents a type of
A) biological environmental hazard. B) cultural environmental hazard. C) physical environmental hazard. D) chemical environmental hazard.
In recent years, the World Bank has
A) increasingly invested in projects that increase development at the expense of the poor. B) stopped loaning money to countries that are unlikely to repay their loans. C) changed its mission to one that includes fighting poverty. D) cooperated with the United Nations to provide food and medical support to developing nations.
Which sequence of events is required to form a limestone cave where you can walk around and observe cave formations, such as stalactites?
A. water dripping from the ceiling, then lowering of the water table, then limestone is below the water table B. limestone is below the water table, then lowering of the water table, then water dripping from the ceiling C. lowering of the water table, then water dripping from the ceiling, then limestone is below the water table D. None of these choices are correct.