#1

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Across
  1. 1. Longitudinal Earthquake (1,4)
  2. 2. Os (6)
  3. 3. In psychology, the human mind (6)
  4. 6. Space station launched by the US in 1973 (6)
  5. 10. Einstein-Rosen bridge (8)
  6. 11. PC range launched by Apple in 1984 (9)
  7. 13. Supply with O (9)
  8. 15. Wild cattle, extinct since the 17th century (7)
  9. 18. Expert in a particular field (10)
  10. 19. Subunits within a cell (9)
  11. 20. Ω (5)
  12. 21. ___ mechanics, theory in physics to describe nature at the smallest scales (7)
Down
  1. 1. Iron sulphide, FeS2 (6)
  2. 3. Symmetrical plane curve (8)
  3. 4. Flowering plant in the iris family (8)
  4. 5. Ge (9)
  5. 7. Polytechnic home to the Lucasian Chair of Mathematics (9)
  6. 8. Valentina ___ (b.1937), cosmonaut (10)
  7. 9. City in which the first nuclear reactor was built (7)
  8. 12. Mineral aggregate; not paper or scissors (4)
  9. 14. Opposite of zenith (5)
  10. 16. Puzzle in which pictures represent words (5)
  11. 17. Dugong or manatee (6)
  12. 22. Elementary particle similar to the electron (4)