| A | B |
|---|
| asthenosphere | partially melted layer of the upper mantle |
| autumnal equinox | start of fall in Nothern hemisphere |
| crust | the outer most layer of the earth |
| geology | study of Earth's surface and interior |
| inner core | innermost layer of Earth |
| international date line | line of longitude where new calendar day begins |
| lithosphere | outer rocky shell of earth (mantle,crust) |
| magnetic field | area around the Earth where electro-magnetic force exists |
| mantle | layer between crust and outer core |
| outer core | layer between inner core and mantle |
| parallax | the shift of an objects position relative to that of another object |
| prime meridian | line of longitude at 0 degrees |
| revolution | the movement of one body around another |
| rotation | the turning of a body |
| standard time zone | lines of longitude that define time (as measured conventionally) |
| summer solstice | first day of summer in Northern hemisphere |
| time meridian | lines of longitude divisible by 15 |
| vernal equinox | start of spring in Northern hemisphere |
| winter solstice | first day of winter in Northern hemisphere |
