Climate Change Crossword

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Across
  1. 4. Anything that is manmade.
  2. 5. The Earth is 4.6_______ years old.
  3. 7. A human cause of climate change by farming, growing crops and cattle.
  4. 10. A human change of climate change by cutting down trees.
  5. 12. Anything that occurs without human input/influence.
  6. 13. The name for oil in it's thick black form.
  7. 14. Geologic period that lasted from 145 - 66 million years ago. Saw the end of the dinosaurs.
  8. 15. These contribute to global warming by ejecting lots of ash and gases.
  9. 16. The man to discovered how to generate an electric current in 1831.
  10. 18. The word used to describe the greenhouse effect when humans contribute to it.
  11. 20. The tilt of the Earth. Changes every 41,000 years.
  12. 21. A greenhouse gas that is emitted from cows in various ways. Chemical formula CH4.
  13. 22. The most recent geological time period which began 2.5 million years ago.
Down
  1. 1. The effect that keeps the planet warm. Named after a glass building.
  2. 2. The gradual change in the Earth's average temperature and weather.
  3. 3. A type of fuel made from the remains of dead organisms.
  4. 6. A compound of hydrogen and carbon, which most oil is made of.
  5. 8. The gradual heating of the Earth.
  6. 9. The name for the orbit of a planet when it is an oval.
  7. 11. Geologic period noted for containing Snowball Earth.
  8. 17. When the Earth is cool enough to sustain ice at the poles.
  9. 19. When the Earth's temperature is high enough to prevent the formation of ice.