''SI''

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Across
  1. 2. where something is eroded
  2. 4. something that sticks to you or something else
  3. 5. where you are not sure what you are doing
  4. 8. something that someone believed was real but not real
  5. 10. when there is a car and another car crash
Down
  1. 1. Something you can do in maths to tell directions
  2. 3. when someone breaks into your house or interrupts you
  3. 6. Where it doesn't happen often
  4. 7. where someone are trying to invade
  5. 9. it has a weird symbol