Physics
Thermohaline circulation is mainly due to

Cold, dense ocean water sinking and warmer water replacing it
Winds causing circulation of ocean water
Warm water being added to the ocean due to industial waste
Warmer, less dense water sinking in the ocean and cold water replacing it

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

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

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