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ACROSS
5. The blanket of air surrounding the Earth's surface
7. An imaginary line which divides the earth into two hemispheres
9. The only planet known to have life
10. The molten rock inside the earth
13. The layer that protects us from harmful ultraviolet rays from the Sun
14. The movement of earth around the sun in a fixed path
DOWN
1. The middle layer of the Earth
2. The first man to land on moon
3. The branch of science that deals with the study of celestial bodies
4. The uppermost layer of the Earth
6. An instrument used to measure an earthquake
8. The spinning movement of earth about its own axis
11. The innermost layer of the Earth
12. Natural satellite of the earth
