Across
- 1. the presence in or introduction into the environment of a substance or thing that has harmful or poisonous effects
- 6. the weather conditions prevailing in an area in general or over a long period.
- 7. involves the management and modification of natural environment or wilderness
- 9. the series of processes by which carbon compounds are interconverted in the environment, involving the incorporation of carbon dioxide into living tissue by photosynthesis and its return to the atmosphere through respiration, the decay of dead organisms, and the burning of fossil fuels.
- 12. is an area of land that drains all the streams and rainfall to a common outlet such as the outflow of a reservoir, mouth of a bay, or any point along a stream channel.
- 13. is the action of surface processes that removes soil, rock, or dissolved material from one location on the Earth's crust, and then transports it to another location.
- 17. the process by which fertile land becomes desert, typically as a result of drought, deforestation, or inappropriate agriculture.
- 18. a substance used for destroying insects or other organisms harmful to cultivated plants or to animals.
- 20. is the physical material at the surface of the earth. Land covers include grass, asphalt, trees, bare ground, water, etc
- 21. describes the breaking down or dissolving of rocks and minerals on the surface of the Earth. Water, ice, acids, salts, plants, animals, and changes in temperature
- 22. is the laying down of sediment carried by wind, water, or ice. Sediment can be transported as pebbles, sand & mud, or as salts dissolved in water.
- 23. is the biogeochemical cycle by which carbon is exchanged among the biosphere, pedosphere, geosphere, hydrosphere, and atmosphere of the Earth.
- 26. prevention of wasteful use of a resource
- 27. a substance used for killing insects.
- 28. a biological community of interacting organisms and their physical environment.
- 29. a rule or directive made and maintained by an authority.
Down
- 2. is most often a non-native species that spreads from a point of introduction to become naturalized and negatively alters its new environment.
- 3. relating to or resulting from living things, especially in their ecological relations.
- 4. waste water and excrement conveyed in sewers
- 5. physical rather than biological; not derived from living organisms.
- 8. rainfall made sufficiently acidic by atmospheric pollution that it causes environmental harm, typically to forests and lakes. The main cause is the industrial burning of coal and other fossil fuels, the waste gases from which contain sulfur and nitrogen oxides, which combine with atmospheric water to form acids.
- 10. a large naturally occurring community of flora and fauna occupying a major habitat, e.g. forest or tundra.
- 11. is any substance that has mass and takes up space by having volume
- 14. a system of interlocking and interdependent food chains.
- 15. also called sprawl or suburban sprawl, the rapid expansion of the geographic extent of cities and towns, often characterized by low-density residential housing, single-use zoning, and increased reliance on the private automobile for transportation.
- 16. the branch of science concerned with classification, especially of organisms; systematics.
- 19. a substance that is toxic to plants, used to destroy unwanted vegetation.
- 24. In biogeography, a species is indigenous to a given region or ecosystem if its presence in that region is the result of only natural processes
- 25. all the waters on the earth's surface, such as lakes and seas, and sometimes including water over the earth's surface, such as clouds.