Science key words

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Across
  1. 2. a benefit of space travel
  2. 6. a type of orbit that follows the direction the earth spins
  3. 9. a type of orbit that passes over the north and south pole
  4. 10. any two value signal
Down
  1. 1. a risk of radiation
  2. 3. a type of resistor whose resistance is strongly dependent on temperature
  3. 4. a risk of space travel
  4. 5. a low earth orbit
  5. 7. any continuous signal
  6. 8. a use of radiation in hospitals