6. Atmosphere consists of 79 percent Nitrogen and 21 percent Oxygen by..... a. Volume b. Weight c. Density d. All of these 7. Which among the following is a climatic factor? a. pressure b. humidity c. temperature d. all of the above 8. Which of the following are major environmental issues involved in mining? a. air pollution b. water pollution c. soil degradation d. all of the above 9. Sustainable development means.... a. meeting present needs without compromising on future needs b. progress of human beings c. balance between human needs and the ability of earth to provide the resources d. all of the above 10. The most important remedy to avoid negative impact due to industrialization is a. industry should be closed b. do not allow new industrial units c. industry should treat all the wastes generated by it before disposal d. industries should be shifted far away from human habitats