Physics
When a piece of pure silicon is doped with aluminium, then

The conductivity of the doped silicon piece will remain the same
The doped silicon piece will become n-type
The doped silicon piece will become p-type
The resistivity of the doped silicon piece will increase

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Physics
Which is evidence that supports the dynamo theory?

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

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