Physics
Atmospheric pressure exerted on earth is due to

Revolution of earth
Gravitational pull
Uneven heating of earth
Rotation of earth

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

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