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B
Earthquake
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C
Fire
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D
Mild breeze
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Solution
The correct option is A Lightning
A thunderstorm is generally accompanied by lightning.
During the development of a thunderstorm, the air currents move upward while the water droplets move downward. These vigorous movements cause the separation of charges. The positive charges collect near the upper edges of the clouds and the negative charges accumulate near the lower edges. There is an accumulation of positive charges near the ground also. When the magnitude of the accumulated charges becomes very large, the air which is normally a poor conductor of electricity is no longer able to resist their flow. Negative and positive charges meet, producing streaks of bright light and sound known as lightning