Physics
Why two thin shirts can keep us warmer than a single thick shirt in winter ?

No radiation of heat takes place
Two thin shirts become thicker so prevent transmission of heat
Air layer between two shirts behaves like insulating media
Air layer between two shirts works as good conductor

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Physics
Which is evidence that supports the dynamo theory?

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

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