Across
- 3. The area of the Earth's stratosphere that contains a relatively high concentration of ozone.
- 4. Phenomenon by which certain gases, which are components of the planetary atmosphere, retain part of the energy that the ground emits because it has been heated by solar radiation.
- 7. A substance or matter in a state in which it will expand freely to fill the whole of a container, having no fixed shape and no fixed volume.
- 10. The envelope of gases surrounding the earth or another planet.
- 11. Change that occurs in nature, that is, it is not caused by human action.
Down
- 1. The regions of the surface, atmosphere, and hydrosphere of the earth occupied by living organisms.
- 2. Colorless, odorless gas produced by burning carbon and organic compounds and by respiration. It is naturally present in air.
- 5. A natural fuel such as coal or gas, formed in the geological past from the remains of living organisms.
- 6. The presence or accumulation of substances in the environment that negatively affect the environment and living conditions, as well as the health or hygiene of living beings.
- 8. electric power
- 9. The action of clearing a wide area of trees.