Physics
Thermohaline circulation is mainly due to

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

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Physics
Two identical solid pieces, one of gold and other of silver, when immersed completely in water exhibit equal weights. When weighed in air (given that density of gold is greater than that of silver)

The gold piece will weigh more
Weighing will depend on their masses
The silver piece will weigh more
Both silver and gold pieces weigh equal

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Physics
A dynamo is a device which

Converts mechanical energy into electrical energy
Converts electrical energy into mechanical energy
Creates electrical energy
Creates mechanical energy

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