Physics
What is the process of conversion of solid state directly to gaseous state called?

Evaporation
Condensation
Distillation
Sublimation

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Physics
Lightning is produced when

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

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