Physics
The quality or tone of a musical sound produced by a stringed instrument depends on

Amplitude of vibration
Length of the strings in the instrument
Frequency of vibration
Wave form of the sound

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Physics
Thermohaline circulation is mainly due to

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

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