The principal cause of desertification is:
A) warming global temperatures due to the burning of fossil fuels.
B) inappropriate land use such as agricultural clearing and overgrazing.
C) extended droughts in untouched rain forest climates.
D) air pollution as rural areas become urbanized.
B
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One of the laws of migration is
A) sometimes you do not have a choice. B) the more distant the destination, the fewer the benefits and the higher the cost. C) involuntary migrations are easier than voluntary migrations. D) most of the migrations are to distant locations rather than local areas.
Why has it been suggested that large earthquakes might be prevented by injecting water along isolated
portions of fault zones that have been inactive for an unusually long time? When was this technique discovered? What will be an ideal response?
Which of the following is not true of hurricanes?
A) Hurricanes form over tropical oceans. B) Hurricanes can travel long distances over land. C) The energy source for hurricanes is condensing water vapor. D) The frequency of hurricanes will increase as climate warms.
The troposphere is the lowest layer in the atmosphere.
Answer the following statement true (T) or false (F)