Science and Maths Croossword Puzzle

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Across
  1. 4. A straight line touching a curve from only one point
  2. 8. Inhale me and I can make you sound like chipmunk.
  3. 10. By how many centimetres does 3 metres exceed 1.3 metres?
  4. 11. You cant live without me.
  5. 12. Islamic scientist who invented algebra. 'The Father of Algebra'
Down
  1. 1. The part of mathematics in which letters and symbols are used to represent numbers and quantities in formulae and equations.
  2. 2. Oxidation and reduction considered together as complementary processes.
  3. 3. You can call me aurum.
  4. 5. I made up 78% of earth atmosphere.
  5. 6. six Which number is equivalent to 3^3 + 3^4 / 3^2?
  6. 7. Numbers in a square root form, example square root of 7
  7. 9. The study of the stars and universe.