The separation of soil into distinct layers is a. horizonation b. soil reaction c. soil structure d. soil color

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.

population. population is the number of people or animals in a particular place. an example of population is over eight million people living in new york city.

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