Physics
On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because:

mercury is a metal.
density of mercury is greater than that of water.
cohesion of water is greater than its adhesion with glass.
cohesion of mercury is greater than its adhesion with glass.

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Physics
Air moves from the region where the air ________

Humidity is low to the region where the humidity is high
Pressure is high to the region where the pressure is low
Pressure is low to the region where the pressure is high
Humidity is high to the region where the humidity is low

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