Most lightning flashes take place inside a cloud, and only a relative few can be seen jumping between two cloud or between earth and a cloud. But, with about 2,000 thunderstorms taking place above the earth every minute of the day and night, there’s enough activity to produce about 100 lightning strikes on earth every second.
Parents can use thunder and lightning to help their children learn more about the world around them. When children understand that the light of the lightning flashing reaches their eyes almost at the same moment, but the sound of the thunder takes about 5 seconds to travel just one mile, they can begin to time the interval between the flash and the crash to learn how close they were to the actual spark.
36. According to the author, in the area of the Central Valley, ______.
(A) rains usually come without thunder and lightning
(B) it is usually dry in April
(C) children pay no attention to natural phenomena
(D) parents are not interested in thunder and lightning
37. We believe that lightning is a downward notion because ______.
(A) we were taught so by our parents from our childhood
(B) we are deceived by our sense of vision
(C) it is a common natural phenomenon
(D) it is a truth proved by science
38. What is TRUE about lightning according to the passage?
(A) Only a small number of lightning flashes occur on earth.
(B) Lightning travels 5 minutes faster than thunder.
(C) Lightning flashes usually jump from one cloud to another.
(D) There are far more lightning strikes occurring on earth than we imagine.
39. The word "activity" (Para. 3, Line 3) is most closely related to the word(s) _____.
(A) "cloud" (C) "lightning flashes"
(B) "lightning strikes" (D) "thunderstorms"
40. It can be concluded from the passage that ______.
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