Use the paragraph below to answer the questions.
Everyone loves walking outside on a cold day, exhaling deeply, and
watching their breath in the air. Did you know that you are essentially
"making a cloud"? When warm moist air and cold air meet, clouds are
formed. For example, when a day was extremely warm and the night
turns cold, heat radiating from the earth's surface comes in contact with
the colder night air and forms low clouds or fog. Another example where
clouds often form is when warm air blows in from over the ocean and
comes in contact with cooler air over land. What is the main idea of the paragraph?