Science

3. computer system that analyzes and displays geographically referenced information.
7. the angular distance of a place east or west of the meridian
9. the angular distance of a place north or south of the earth's equator
11. distance above sea level
12. the difference in elevation represented by each contour line on a topographic map
13. a large area of flat land
14. he rise or fall of the land surface.
15. an accurate worldwide navigational and surveying facility based on the reception of signals from an array of orbiting satellites

1. a large natural elevation of the earth's surface rising abruptly from the surrounding level; a large steep hill
2. difference in elevation considered collectively, of a land surface
4. distance on a map and the corresponding distance on the earth
5. the use of elevation contour lines to show the shape of the Earth's surface
6. a list of symbols that appear on the map
8. an imaginary line drawn around the earth equally distant from both poles, dividing the earth into northern and southern hemispheres
10. an area of relatively level high ground
12. bold or thicker lines that appear at every fifth contour line