Which of the following explains why the West Coast of Canada is a moist environment?
A. the effect of continental air masses
B. the presence of mountains
C. Arctic outflows that bring cold air into the area
D. warm ocean currents
Answer: B
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The amount of friction acting when two blocks slide against each other depends on
A. the "stickiness" of atoms on their surfaces. B. the kinds of material being pressed. C. how much they are pressed together. D. all of the above
An example of a positive feedback loop ________
A) is melting arctic snow exposing dark surfaces that heat up and cause further melting B) are predators eating most of their prey and then declining in numbers C) is a pond becoming more acidic as a result of pollution D) are birds migrating south in response to colder temperatures E) is a thermostat turning on the furnace as the temperature drops
The Storm Prediction Center in Norman, Oklahoma, maintains a constant vigil for:
A) floods and flash floods. B) snow storms. C) hurricanes and tropical storms. D) thunderstorms and tornadoes.
Demographers usually measure mortality in terms of
A. Deaths per 1,000 persons per year B. Deaths per person per year C. Total deaths in a population per year D. The number of children who die per year E. The total number of deaths per generation