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

Convection
Terrestrial Radiation
Insolation
Conduction

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Physics
Water pipes in hilly areas often burst on a cold frosty night, because

Water in the pipes freezes and on freezing water expands, so pipes break
Frost makes the pipes rusty, so they break
None of these
The material of which pipes are made contracts due to cold and so breaks

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