Physics
Which one of the following is applicable to collision-coalescence process of precipitation?

Clouds which extend beyond the freezing level
All types of clouds
Cirrocumulus cloud
Clouds which do not extend beyond the freezing level

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Physics
Lightning is produced when

Strong opposite charges in different clouds break down the resistance offered by the intervening air
Similar charges of electricity rush towards each other and then get repelled
Water vapour produces electricity in the clouds
Clouds strike against impurities in air and the friction burns up these impurities

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