Physics
The large collection of stars, dust and gas held together by gravitational attraction between components is known as

Sun Family
Atmosphere
Galaxy
Cluster

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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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