Across
- 3. roughly 55% of the uppermost layer of earth is this
- 4. horizontal positon (east, west) relative to a spherical surface
- 8. a half of earth (northern, eastern, etc.)
- 9. the wobble of earth's axis, responsible for subtle changes of the night sky over time
- 10. longest day in northern hemisphere, shortest day in southern hemisphere
- 11. path at which an object revolves around another
- 12. occurs in September; day and night lengths in Northern & Southern Hemispheres are equal
Down
- 1. line that defines the latitudinal center on earth
- 2. the speed (and direction) at which an object can escape the gravity of a large mass
- 5. innermost layer believed to be made of solid iron and nickel
- 6. smallest and uppermost layer of the earth
- 7. a deviation in angle from the vertical (earth's is 23.5)