Environmental Science
Low clouds retard surface cooling at night better than clear skies because:

The clouds absorb and radiate infrared energy back to earth
The water droplets in the clouds reflect infrared energy back to earth
The clouds are better conductors of heat than is the clear night air
The formation of the clouds releases latent heat energy
The clouds start convection currents between them

ANSWER DOWNLOAD EXAMIANS APP

Environmental Science
The wind-chill factor:

Takes into account humidity and air temperature in expressing the current air temperature
Determines how low the air temperature will be on any given day
Indicates the temperature at which water freezes on exposed skin
Relates body heat loss with wind to an equivalent temperature with no wind
Tells farmers when to protect crops from a freeze

ANSWER DOWNLOAD EXAMIANS APP