Physics
A simple microscope consists of :

A long focus concave lens
A short focus concave lens
A long focus convex lens
A short focus convex lens

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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
Warmer, less dense water sinking in the ocean and cold water replacing it
Winds causing circulation of ocean water

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