Physics
Ice is packed in saw dust because

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

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Physics
A white and smooth surface is

Bad absorber and bad reflector of heat
Good absorber and good reflector of heat
Good absorber and bad reflector of heat
Bad absorber and good reflector of heat

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