Across
- 6. The trapping of the sun's warmth in a planet's lower atmosphere
- 8. The production and discharge of something, esp. gas or radiation
- 10. Able to be maintained at a certain rate or level
- 16. The very highest levels of a profession or other sphere, or of prices or other quantities
- 18. An oxide containing two atoms of oxygen in its molecule or empirical formula
- 19. A colorless, odorless flammable gas, CH4, that is the main constituent of natural gas
- 20. The state or process of a species, family, or larger group being or becoming extinct
- 21. Of or containing nitrogen with a lower valence, often three
- 22. Predict or estimate weather
- 24. A thick subsurface layer of soil that remains frozen throughout the year, occurring chiefly in polar regions
- 26. Of or relating to the entire earth as a planet
Down
- 1. The state of being diverse; variety
- 2. Become liquefied by heat
- 3. An atom of this element
- 4. Land consisting of marshes or swamps; saturated land
- 5. The degree or intensity of heat present in a substance or object
- 7. Ultraviolet
- 9. The action or process of causing so much damage to something that it no longer exists or cannot be repaired
- 11. The air in any particular place
- 12. Biological community of interacting organisms and their physical environment
- 13. The weather conditions prevailing in an area in general or over a long period
- 14. Cover or submerge (a place or area) with water
- 15. The energy transmitted in this way
- 17. The surroundings or conditions in which a person, animal, or plant lives or operates
- 23. When somehting becomes cosier
- 25. The planet on which we live, the third planet from the sun in the solar system