Jawaban:

6. The result of the burning of coal and oil is the release of carbon dioxide and other greenhouse gases into the atmosphere, which contributes to global warming, as well as the release of other pollutants that can have harmful effects on human health and the environment.

7. Without specific information about the text in question, it is impossible to determine what it is mainly about.

8. The sulfur oxides and nitrogen oxides released by burning fossil fuels can react with other chemicals in the atmosphere to form sulfuric acid and nitric acid, respectively. These acids can contribute to the formation of acid rain, which can have harmful effects on the environment and human health.

9. It is impossible to answer this question without knowing the options or information provided about acid rain.

10. Without specific information about the text in question, it is impossible to determine its purpose. However, the purpose of a text can vary depending on the author's intention, such as to inform, persuade, entertain, or educate the reader.