Physics
Why does ice covered in sawdust not melt quickly ?

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

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Physics
The law of conservation of energy states that

Energy can either be created nor destroyed
Energy can neither be created nor destroyed
Energy can neither be created or destroyed
Energy can either be created or destroyed

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