Earth

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Across
  1. 3. tough outer part of earth
  2. 6. sun reaches most north and south excursion
  3. 8. boundary making earth less dense
  4. 10. thick layer of silicate rock
  5. 11. ferromagnetic transition metal
  6. 13. circular movement of object around axis
  7. 14. sun crosses celestial equator
  8. 16. marks first day of summer
Down
  1. 1. daytime starts becoming longer
  2. 2. imaginary line drawn around earth
  3. 4. speed object needs break celestial gravity
  4. 5. orbital motion of one body around another
  5. 7. successive meridian transits of the sun
  6. 9. thick layer of molten iron and nickel
  7. 12. time between two consecutive transits
  8. 15. curved path an object takes due to gravity