Across
- 7. Fossil fuels are rich in this element; one of the most abundant elements on Earth
- 9. What greenhouse gases do with heat on Earth
- 10. Oxygen and fuel react to produce water and carbon dioxide
- 11. Fossil fuels are formed from the remains of organisms from millions of years ago; true or false?
- 13. The most abundant greenhouse gas; chemical symbol is CO.2
- 14. Opposite reaction of photosynthesis
- 15. Sudden or gradual change in Earth’s climate
- 19. Conditions in the atmosphere at a given place and time
- 20. Plants release this element in photosynthesis
- 21. Greenhouse gases in the atmosphere help moderate Earth’s energy and keep the climate ______
- 24. Removal of forests
- 25. The amount of greenhouse gases that humans release as a result of our activities is our carbon _____________
Down
- 1. Growth of cities and populations living in cities
- 2. Organisms that bring carbon into the biosphere from the atmosphere
- 3. Break down of dead plants and animals; releases carbon back into the soil and rock
- 4. Ocean currents move warm and cold water around Earth to _________ global temperatures
- 5. Carbon dioxide is absorbed by plants (producers) and converted into food
- 6. Greenhouse gases work by trapping the Sun’s energy (heat) that is reflected back into space; true or false?
- 7. Pattern of weather in an area over a long period of time
- 8. An increase in carbon dioxide/greenhouse gases in our atmosphere causes Earth to become (cooler/warmer)
- 12. Deforestation causes (more/less) carbon dioxide to remain in the atmosphere
- 16. As human activity increases, we will see an (increase/decrease) in greenhouse gases
- 17. Climate is determined by the amount and movement of (cold/heat) on Earth
- 18. If humans want to reduce their impact on our environment, they should use (more/less) fossil fuels
- 22. Volcanic eruptions and meteor impacts can cause global _________ by blocking or reflecting sunlight
- 23. Greenhouse gas that is released from livestock waste