Across
- 2. the term used to describe the process in which the planet is heating up. (2 words)
- 4. Burning fossil fuels such as natural gases, coal and oil releases carbon dioxide as a __-____
- 5. Carbon dioxide builds up in the earths atmosphere faster than the carbon cycle can handle, this is endangering us because it prevents the _______ of UV rays
- 6. plants were subjected to extreme heat and pressure for
- 7. Releasing harmful chemicals such as various types of gases can cause air ______ among other things.
- 10. The rock
- 11. of years.
- 12. A hard, black colored rock-like substance formed when
- 13. This is caused by poisonous gases like sulfur dioxide, and it corrodes buildings. (2 words)
Down
- 1. The primary greenhouse gas responsible for global warming is __(2 words)__
- 3. years to form.
- 8. An effect of fossil fuels is that it lets out _____ gases.
- 9. Fossil fuels are a ______ energy source since they take millions