Threats to the world

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Across
  1. 5. Tropical storm over the Atlantic and Eastern Pacific
  2. 7. The distribution of heat over the Earth’s surface
  3. 9. Areas (with a lower surface temperature) on the surface of the Sun which appear darker
  4. 11. The scientific method of dating tree rings to the exact year they were formed
  5. 13. The direction the Earth’s axis of rotation is pointed
  6. 14. The largest cell
  7. 17. The shape of the Earth’s orbit
  8. 18. Tropical storm over the Western Pacific
  9. 20. The angle the Earth’s axis tilt in respect to the Earth’s orbital plane
Down
  1. 1. A cylinder of ice used to determine how the past climate was
  2. 2. The period of time that we are currently living in
  3. 3. Expansion of seawater as it warms
  4. 4. The cooler periods (the troughs in the graph)
  5. 6. The force causing the winds to spin depending on which Hemisphere the tropical storm is on
  6. 8. The centre cell
  7. 10. A way to keep the Earth’s atmosphere warm
  8. 12. The warmer periods (the peaks in the graphs)
  9. 15. Tropical storm over the Indian Ocean
  10. 16. Tropical storms over Australia and New Zealand
  11. 19. The smallest and weakest cell