Because when the air cools hot air rises and so does the moistier and then it condenses and produces clouds which produce rain
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I would say that Melissa has made the mistake of using the same uncleaned cutting board first for cutting up chicken which is notorious for forming bacteria quickly when out of the fridge and then chopping vegetables on it thus running the possibility of contaminating the vegetables with chicken bacteria. She should ensure she washes the cutting board carefully with soap and water to avoid contamination of the vegetables.
