Across
- 3. connects points of equal elevation
- 7. shows changes in elevation of Earth’s surface
- 8. all the water on Earth, including the water in the air
- 10. the study of the interactions of organisms and their surroundings
- 12. reference point for longitude that passes through Greenwich, England, and represents 0°
- 14. distance in degrees east or west of the prime meridian
- 16. the study of the materials that make up Earth, the processes that form and change these materials, and the history of the planet and its life-forms since its origin
- 18. the study of the forces and processes that cause the atmosphere to change and produce weather
- 19. science of mapmaking
- 20. all organisms on Earth as well as the environments in which they live
Down
- 1. the ratio between distances on a map and distances on the surface of Earth
- 2. the process of gathering data about Earth using instruments mounted on satellites, airplanes, or ships
- 4. imaginary line that separates Earth into northern and southern hemispheres
- 5. key that explains what symbols represent
- 6. a satellite navigation system that allows users to locate their approximate position on Earth
- 9. the difference in elevation between two lines
- 11. the study of Earth’s oceans
- 13. the blanket of gases that surrounds the planet
- 14. distance in degrees north or south of the equator
- 15. the area from the surface of Earth down to its center
- 17. the study of objects beyond Earth’s atmosphere