Across
- 2. The gradual increase in the overall temperature of the earth's atmosphere, mainly due to gases being emitted making the greenhouse effect trap in more heat.
- 5. A natural fuel such as coal or gas formed in the geological past from the remains of living organisms.
- 7. Any natural resource that can replenish itself in a relatively short period of time, usually no longer than the length of a human life.
- 8. Warmer periods between glacial periods (ice ages)
- 12. amount of carbon dioxide gas in the atmosphere; one of Earth's vital signs
- 16. the movement of carbon from the nonliving environment into living things and back
- 19. a period of colder global temperatures that features recurring glacial expansion across the Earth's surface
- 20. The amount of heat held in the ocean; one of Earth's vital signs.
- 21. A natural resource that is not replaced in a useful time frame.
Down
- 1. The average level of the ocean's surface at any given time; one of Earth's vital signs
- 2. average surface temperature of the Earth (including land and ocean temps); one of Earth's vital signs.
- 3. Greenhouse gas that comes from burning fossil fuels, leaking pipelines, fracking, cows, decomposition of once living things.
- 4. A measurement of the area of ocean where there is at least some sea ice; one of Earth's vital signs.
- 6. The production and discharge of something, especially gas or radiation.
- 9. Changes to the Earth's atmosphere including storms, rainfall and temperature that increase or decrease global temperatures.
- 10. A gas that contributes to the greenhouse effect.
- 11. The natural process by which the atmosphere traps some of the Sun's energy, warming the Earth enough to support life.
- 13. A fuel made out of things such as crops.
- 14. the size/amount of glaciers that spread over land in all directions; one of Earth's vital signs
- 15. A gas that currently contributes the most to climate change; most living things exhale/breathe out this gas, also produced by the burning of fossil fuels.
- 17. An area that absorbs more carbon than it emits. Ex: forest, because the trees absorb more carbon than they emit.
- 18. A gas in the atmosphere that contributes to global warming, weather, and climate.