Physics
Ice is packed in saw dust because

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

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Physics
In heating frozen foods in sealed pouches in a microwaves, why do you first poke holes in the pouch?

To allow the aroma of the food to come out through the holes
To allow the heat to get into the food through the hole
To prevent the steam pressure from bursting open the pouch
To allow the microwaves to get into the food through the holes

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