The origin of cP and cA air masses that enter the United States is
a. Northern Siberia.
b. the Northern Atlantic Ocean.
c. Antarctica.
d. Northern Canada and Alaska.
e. the Eastern Pacific Ocean.
ANSWER: d
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Storing drinking water in a reservoir is beneficial because it ____.
A. reduces the dissolved oxygen level B. makes water treatment unnecessary C. allows suspended matter to settle D. allows the water to be ionized by the atmosphere E. increases populations of healthy coliform bacteria
Although coal is an abundant fuel, when burned it produces very high _____________________ emissions.
Fill in the blank(s) with the appropriate word(s).
Judge the following sentence according to the criteria given below: In freshwater lakes, cooling or
warming to 0.4?C is an important tipping point BECAUSE 0.4?C is the actual temperature when lake water freezes. a. The assertion and the reason are both correct, and the reason is valid. b. The assertion and the reason are both correct, but the reason is invalid. c. The assertion is correct, but the reason is incorrect. d. The assertion is incorrect, but the reason is correct. e. Both the assertion and the reason are incorrect
Thunderstorms are typically caused by ________
Fill in the blank(s) with the appropriate word(s).