Physics
Ice is packed in saw dust because

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

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Physics
Solar eclipse will take place when

the earth is between the moon and the sun
the moon does not lie on the line joining the sun and the earth
the moon is between the sun and the earth
the sun is between the moon and the earth

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