Callan's Crossword

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Across
  1. 2. strengthening the heart and lungs by excercise
  2. 5. The study of land with different types and shapes
  3. 6. relating to fragments of rock from a volcano
  4. 7. A rock containing a crystal cavity
  5. 9. A mental disorder that gives you the desire to set fire to things
  6. 10. Something performed in the air
Down
  1. 1. having a shape that reduces wind resistance
  2. 3. A display of fireworks
  3. 4. To flush something out with air
  4. 8. Relating to the natural heat within the earth