| A | B |
|---|
| Isoline | a line that connects points of equal value |
| Longitude | the angular measurement east or west of the Prime Meridian |
| altitude | the angular measurement of a star above the horizon |
| Prime Meridian | 0 degrees longitude |
| Lithosphere | solid outer rock shell of Earth |
| Atmosphere | layer of gases surrounding the Earth's surface |
| Latitude | angular measurment North or South of the equator |
| gradient | change in field value over a distance |
| Equator | 0 degrees latitude |
| horizon | where ground & sky meet |
| hydrosphere | layer of water that is in or rests on the Earth's surface |
| Polaris | star directly over North Pole |
