Physics
Stars appears to move from east to west because

All stars move from east to west
The earth rotates from west to east
The earth rotates from east to west
The background of the stars moves from west to east

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Physics
Thermohaline circulation is mainly due to

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
Cold, dense ocean water sinking and warmer water replacing it

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