Where is chicken pox most common? ?

If I'm incorrect (meaning you might wanna do some back-up research about this) is most common in the United States, from what I researched about 98% of adults get it.

1 and 6 for apex

sulfur dioxide

explanation: acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. these substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.