Big issues

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Across
  1. 1. The place where something comes from.
  2. 4. To change or influence something.
  3. 5. To use money to try to earn more money in the future.
  4. 6. In a regular and constant way.
  5. 7. To grow or improve something over time.
  6. 12. In a very big and sudden way.
  7. 14. A careful study to learn new facts or find answers to questions.
  8. 15. The smallest living part of an animal or plant.
  9. 16. To travel through a place to learn more about it.
Down
  1. 2. Long-term changes in temperature and weather patterns.
  2. 3. To say what you think will happen in the future.
  3. 8. A sudden shaking of the ground.
  4. 9. Energy that comes from the sun.
  5. 10. Something that makes a sick person healthy again.
  6. 11. The chance that something bad or dangerous might happen.
  7. 13. Something that makes something else happen.
  8. 17. To use all of something and have no more left.