Across
- 4. North-South lines
- 6. makes up inner core
- 7. longest nighttime
- 9. East-West lines
- 10. longest daytime
- 13. planets _ around the sun
- 14. middle longitude line
- 15. half of the earth
Down
- 1. fall's start
- 2. spring's start
- 3. 2nd layer
- 5. thinnest layer of the earth
- 8. causes seasons
- 11. boundary between crust + mantle
- 12. solid dense metal