No, dew is liquid water and it forms when the air temperature drops sufficiently that the air can no longer hold all its water vapour. This must be above freezing point. Of course the same argument applies when the temperature does drop below zero, but then we get ice crystals instead of water drops, and we call it frost.
Yes, but it forms ice crystals rather than drops of liquid water. (Check your windshield.)
At its outer edge, where it meets the atmosphere, the temperature of the crust of the Earth is the same temperature as the air. So, it might be as hot as 35 °C in the desert and below freezing in Antarctica.
If the temperature is below freezing outside, there is no need to run the air conditioning. The heater does not use the same set up as the air conditioning. This may be a built in feature of the car so the compressor does not completely freeze up. As air conditioning is running, freon passes through the compressor, making it quite cold internally.
capacity and specific humidity are the same
The word "cold" is already an adjective, since it can describe a noun: We are having cold temperatures this week. (It tells what kind of temperature.) There is cold air coming in through the window. (It tells what kind of air.) But it should be noted that the word "cold" can also be a noun, meaning an illness where you sneeze and cough.
Removing heat from the air will lower its temperature.
ground temperature below freezing, and air temperature slightly above freezing.
Where air planes fly, the temperature is below freezing.
When the temperature is below freezing, moisture in the air will crystalize into snowflakes.
Not as long as the air temperature remains below freezing.
Usually the humidity is extremely low when the temperature drops below freezing, because almost all of the water is frozen out of the air.
TALL MOUNTAINS BLOCK THE COLD AIR
Yes. The freezing point is only for water. It has nothing to do with smell. Polar bears hunt through smell in temperatures well below freezing.
Snow forms when the atmospheric temperature is at or below freezing and there is enough moisture in the air. But the temperature at the ground level may be warmer, sometimes above freezing.
frost
When there is a large concentration of water in cloud formation, when the air temperature is below freezing.
snow
The Tall Mountains Block The Cold Air