Words ending in sion

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Across
  1. 4. when things slowly crumble
  2. 6. type of maths calculation
  3. 7. when you have to make a choice
  4. 8. when you get picked to join a group
  5. 9. when aliens come to earth
  6. 10. when you don’t understand something
Down
  1. 1. when something blows up
  2. 2. you watch programmes on it
  3. 3. looking back on school work to prepare for a test
  4. 5. when things bump into each other violently