Physics
The cooling by a desert Cooler is based on:

Air Rehydration
Evaporative Cooling
Hot air replacement
Air dehydration

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Physics
Thermohaline circulation is mainly due to

Winds causing circulation of ocean water
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

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Physics
Railway tracks are banked on curves so that

No frictional force may be produced between the tracks and the wheels of the train
Necessary centripetal force may be obtained from the horizontal component of the weight of the train
Necessary centrifugal force may be obtained from the horizontal component of the weight of the train
The train may not fall down inwards

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Physics
Solar eclipse will take place when

the moon does not lie on the line joining the sun and the earth
the earth is between the moon and the sun
the sun is between the moon and the earth
the moon is between the sun and the earth

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