When the base of the cloud is positively charged and the ground negatively charged, a(n) ____________________ cloud-to-ground lightning flash may result.
Fill in the blank with correct word.
Q. 2Sometimes there is only one lightning stroke, but more often the leader-and-stroke process is repeated in the same ionized channel at intervals of about four-hundredths of a second. The subsequent leader, called a ____________________ proceeds from the cloud along the same channel as the original stepped leader; however, it proceeds downward more quickly because the electrical resistance of the path is now lower.
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Q. 3Because unlike charges attract one another, the negative charge at the bottom of the cloud causes a region of the ground beneath it to become ____________________ charged.
Fill in the blank with correct word.
Q. 4When warmer hailstones come in contact with colder ice crystal, an important phenomenon occurs: There is a net transfer of ____________________ ions (charged molecules) from the warmer object to the colder object.
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Q. 5Sound travels ____________________ in warm air than in cold air.
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Q. 6A sound occasionally mistaken for thunder is the ____________________.
Fill in the blank with correct word.
Q. 7____________________ is a discharge of electricity, a giant spark, which usually occurs in mature thunderstorms.
Fill in the blank with correct word.
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