Physics
Tensional forces normally cause which one of the following?

Thrust faults
Strike-slip faults
Reverse faults
Normal faults

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

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

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