Physics
Even after sunset, the air near the Earth's surface continue to receive heat due to

Convection
Terrestrial Radiation
Conduction
Insolation

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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:

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

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