Physics
Gamma rays are emitions that have

Neither mass nor charge
Charge but no mass
Mass but no charge
Both mass and charge

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Physics
Lightning is produced when

Water vapour produces electricity in the clouds
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
Clouds strike against impurities in air and the friction burns up these impurities

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