Physics
Why does ice covered in sawdust not melt quickly ?

Sawdust does not allow the air to touch the ice
The water is absorbed by sawdust
Sawdust is a bad conductor of heat
Sawdust is good conductor of heat

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Physics
Lightning is produced when

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

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