What r the 4 seasonal stages of the year ?

What kind of action is a cause of air pollution

Would really appreciate it, i have an idea but not completely sure

Ronald wants to see if a new shower cleaner works better in removing soap than his old cleaner. he uses the new cleaner on one half of the shower tiles and his old cleaner on the other half. identify the independent and dependent variables in this experiment. enter your answer in the space provided.