| A | B |
|---|
| geology | The study of the Earth and how it has changed |
| Inner Core | solid iron nickle center of the Earth |
| Mantle | thickest middle layer of the Earth |
| Crust | Thin rigid outer skin of the Earth |
| Asthenosphere | slushy layer within the mantle |
| Lithosphere | the crust and the very top of the mantle |
| Magnetic Field | the area around the Earth where a magnetic force exists |
| Outer Core | Liquid iron nickle layer near the center of the Earth |
| Rotation | circular motion around an objects own axis |
| Standard Time Zones | areas where people agree to use the time for noon |
| Time Meridian | the meridian to which clocks are set in a time zone |
| Prime Meridian | the 0 degree meridian passing through Greenwich England |
| International date line | meridian at which the calander date is changed |
| Revolution | circular movement around another object |
| Constellations | patterns of stars |
| Parallax | the apparent movement caused by a change in viewing postion |
| Perihelion | When the Earth is closest to the Sun |
| APhelion | When the Earth is farthest from the sun |
| Zenith | a point directly overhead at 90 degrees |
| Solstice | the shortest or longest day of a year |
| Equinox | days in which the daylight and nighttime hours are the same |
