The threshold level for harmful effects of toxic pollutants is most closely related to the
A) first appearance of chronic effects.
B) time of day of exposure.
C) concentration of exposure.
D) concentration and duration of exposure.
D
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If the pinhole experiment is conducted at the time of a partial solar eclipse when the Sun is crescent shaped, the image will be
A. a crescent. B. an ellipse. C. as round as with no eclipse. D. impossible to say
Wind directions are from low pressure to high pressure.
Answer the following statement true (T) or false (F)
Temperatures in the deep oceans are ________ at low latitudes compared to high latitudes
A) about the same B) higher C) very constant D) highly variable E) lower
In the United States, the major share of municipal soil wastes end up in
A. sanitary landfills. B. open dumps. C. incineration facilities. D. oceans.