Surely not a revision crossword for different school subjects

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Across
  1. 4. 9,5 Billion km
  2. 8. 1 millionth of a meter
  3. 9. hardest material on earth
  4. 10. 82nd element of the periodic table
  5. 11. State of matter that barely or doesn't move
  6. 12. State of matter where the substance takes the shape of the container
  7. 13. 1 hundrendth of a liter
Down
  1. 1. 3.1415926
  2. 2. 1st step of the scientific procedure
  3. 3. H2O
  4. 5. has 3 sides
  5. 6. Half of the diameter
  6. 7. 1st element of the periodic table
  7. 8. combination of atoms
  8. 14. parallelogram with opposite equal acute angles, opposite equal obtuse angles, and four equal sides