The most important threat to survival of polar bears at this time is
a. ocean currents delivering pollutants to the Arctic Ocean from oceans in more temperate climate zones
b. hunting by native populations
c. tourism disruptions
d. warming of the frozen Arctic, which has has caused the winter ice pack to shrink and break up earlier, thus limiting hunting opportunities for the bears
e. a normal population cycle that will result in their slow extinction
D
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Which law most underlies the impulse-momentum relationship?
A. Newton's second law. B. Newton's third law. C. Newton's first law. D. all about equally
A mineral that has two prominent directions of cleavage that form angles of 56 and 124 degrees with each other is:
a. orthoclase feldspar b. augite (pyroxene) c. hornblende d. galena
From which countries are many female labor migrants to North Africa and the Middle East?
A) India and Mexico B) India and the Philippines C) Indonesia and the Philippines D) Indonesia and Mexico E) none of the above
Which of the following variables would be used to estimate potential evapotranspiration?
A) Temperature and precipitation B) Precipitation and evaporation C) Temperature and latitude D) Wind speed and latitude E) Precipitation and humidity