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 prevent the steam pressure from bursting open the pouch
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

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Physics
Which is evidence that supports the dynamo theory?

Earth's core contains a large amount of iron
Convection occurs in Earth's inner core
Granite and basalt conduct electricity
Earth's outer core contains liquid that conducts electricity

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