Hans crossword '-'

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Across
  1. 4. The ______ root of 1 is you know what.
  2. 6. A world where everything is bad
  3. 7. A American mountain dwelling lion.
  4. 8. a dangerous condition where the body temperature drops below 35°C
  5. 9. A leader of a independant country
  6. 10. You use it to solve math questions
Down
  1. 1. The start of a speech
  2. 2. You can enter this once you retire
  3. 3. A person who is very good at calculations
  4. 5. Superman has __________!
  5. 10. The 'ship of the desert