Physics
Outside of cooking utensils are generally left black from below because

Black surface is a poor conductor of heat.
It is difficult to clean daily.
Black surface is a good absorber of heat.
Black surface is a good conductor of heat.

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Physics
Which is evidence that supports the dynamo theory?

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

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