Across
- 1. aim to preserve (a threatened species or area) by legislating against collecting, hunting, or development.
- 4. inflict physical harm on (something) so as to impair its value, usefulness, or normal function.
- 5. the level of the sea's surface, used in reckoning the height of geographical features such as hills and as a barometric standard.
- 9. the action of clearing a wide area of trees.
- 11. an exceptionally large ocean wave, especially one caused by an underwater earthquake or volcanic eruption.
- 12. a mobile, destructive vortex of violently rotating winds having the appearance of a funnel-shaped cloud and advancing beneath a large storm system.
- 17. a gradual increase in the overall temperature of the earth's atmosphere generally attributed to the greenhouse effect caused by increased levels of carbon dioxide, CFCs, and other pollutants.
- 20. an overflow of a large amount of water beyond its normal limits, especially over what is normally dry land.
- 21. a general term used to refer to chemical compounds produced by industry which, if they are ingested or breathed in by humans, can cause physiological damage.
- 22. the trapping of the sun's warmth in a planet's lower atmosphere, due to the greater transparency of the atmosphere to visible radiation from the sun than to infrared radiation emitted from the planet's surface.
- 23. unwanted or unusable material, substances, or by-products.
- 24. rainfall made so acidic by atmospheric pollution that it causes environmental harm, chiefly to forests and lakes. The main cause is the industrial burning of coal and other fossil fuels, the waste gases from which contain sulphur and nitrogen oxides which combine with atmospheric water to form acids.
- 25. convert (waste) into reusable material.
Down
- 2. the emission of energy as electromagnetic waves or as moving subatomic particles, especially high-energy particles which cause ionization.
- 3. a storm with a violent wind, in particular a tropical cyclone in the Caribbean.
- 6. a mountain or hill, typically conical, having a crater or vent through which lava, rock fragments, hot vapour, and gas are or have been erupted from the earth's crust.
- 7. a sudden violent shaking of the ground, typically causing great destruction, as a result of movements within the earth's crust or volcanic action.
- 8. a building or group of buildings where goods are manufactured or assembled chiefly by machine.
- 10. a person who is concerned about protecting the environment.
- 13. a substance used for destroying insects or other organisms harmful to cultivated plants or to animals.
- 14. the production and discharge of something, especially gas or radiation.
- 15. a prolonged period of abnormally low rainfall, leading to a shortage of water.
- 16. the presence in or introduction into the environment of a substance which has harmful or poisonous effects.
- 18. a layer in the earth's stratosphere at an altitude of about 10 km (6.2 miles) containing a high concentration of ozone, which absorbs most of the ultraviolet radiation reaching the earth from the sun.
- 19. a large, destructive fire that spreads over a forest or area of woodland.