These blotches are called what? the layer of the sun where these occur is called the what?

Sunspot are spots found on the sun's surface that occur because these regions have a lower temperature than the temperature of the rest of the solar surface, so it seems darker for our observation. It is a temporary phenomenon and is a region that concentrates high magnetic field due to reduced temperature.

the national environmental policy act (nepa) is a united states environmental law that promotes the enhancement of the environment and established the president's council on environmental quality (ceq). the law was enacted on january 1, 1970. to date, more than 100 nations around the world have enacted national environmental policies modeled after nepa.

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.