Crossword Puzzle about future world and making arrangements

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Across
  1. 1. When too many people live in one area.
  2. 4. Long-term shifts in global temperatures.
  3. 7. Collect someone or something.
  4. 9. Meet someone unexpectedly.
  5. 11. Harmful substances released into the environment.
  6. 13. Journeying beyond Earth into outer space.
  7. 14. Participate or join in with an activity.
  8. 15. A sudden increase in criminal activity.
  9. 16. A digital environment created by computers.
  10. 17. Machines that can perform tasks automatically.
  11. 19. Invite people to your home.
Down
  1. 2. A disease that spreads quickly among many people.
  2. 3. Armed conflict between nations or groups.
  3. 5. Technology that allows machines to think or learn.
  4. 6. A large structure where astronauts live in orbit.
  5. 8. Leave home to do something enjoyable.
  6. 10. Deliver something or someone to a location.
  7. 12. A sudden disaster causing great damage.
  8. 13. Remain at home instead of going out.
  9. 15. Visit someone briefly.
  10. 18. Arrange to see someone at an agreed place.