1. What is the primary composition of Earth's atmosphere?
2. Which sphere of the Earth contains all living organisms?
3. The Earth's mantle is known for its ;
4. Which sphere of the Earth includes all water bodies, such as oceans and rivers?
5. The ...........is the mixture of gases that surrounds the Earth.
6. Earth's structure is made up of ...........layers.
7. What generates the Earth's magnetic field?
8. What are the main layers of the Earth's internal structures?
9. The following are the methods of preventing air pollution except?
10. Excavation of minerals in the soil is done by?
