Physics
Ice is packed in saw dust because

Saw dust does not stick to the ice.
Saw dust is a good conductor of heat.
Saw dust is poor conductor of heat.
Saw dust will not get melted easily.

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Physics
Why are we able to hear short wave broadcasts better than long wave broadcasts ?

Short wave broadcasts are made by nearby radio stations.
Short waves are unaffected by atmospheric disturbances.
By convention, short waves are meant for long distances, whereas long waves are reserved for short distances.
Short waves are more energetic than long waves.

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