environmental systems a vocab

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Across
  1. 5. The act or process of preserving, or keeping safe; the state of being preserved, or kept from injury, destruction, or decay; security; safety; as, preservation of life, fruit, game, etc.; a picture in good preservation.
  2. 8. key- is a tool that allows the user to determine the identity of items in the natural world, such as trees, wildflowers, mammals, reptiles, rocks, and fish. Keys consist of a series of choices that lead the user to the correct name of a given item. "Dichotomous" means "divided into two parts".
  3. 9. area or ridge of land that separates waters flowing to different rivers, basins, or seas.
  4. 12. niche-is a term for the position of a species within an ecosystem, describing both the range of conditions necessary for persistence of the species, and its ecological role in the ecosystem.
  5. 13. process by which fertile land becomes desert, typically as a result of drought, deforestation, or inappropriate agriculture.
  6. 14. rain-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.
  7. 16. of wasteful use of a resource.
  8. 18. to or resulting from living things, especially in their ecological relations.
  9. 21. substance that is toxic to plants, used to destroy unwanted vegetation.
  10. 23. variety of life in the world or in a particular habitat or ecosystem
  11. 24. change or the process of change by which an organism or species becomes better suited to its environment.
  12. 25. biological community of interacting organisms and their physical environment.
Down
  1. 1. large natural or artificial lake used as a source of water supply.
  2. 2. diversity- refers to the range of habitats present in a region
  3. 3. are substances used to kill insects. They include ovicides and larvicides used against insect eggs and larvae, respectively. Insecticides are used in agriculture, medicine, industry and by consumers.
  4. 4. dependence of two or more people or things on each other
  5. 6. large naturally occurring community of flora and fauna occupying a major habitat, e.g. forest or tundra.
  6. 7. species-An invasive species is a species that is not native to a specific location, and that has a tendency to spread to a degree believed to cause damage to the environment, human economy or human health
  7. 10. of the depletion of natural resources in order to maintain an ecological balance.
  8. 11. substance used for destroying insects or other organisms harmful to cultivated plants or to animals.
  9. 15. weather conditions prevailing in an area in general or over a long period.
  10. 17. species-A species that normally lives and thrives in a particular ecosystem. This can include any species that developed with the surrounding habitat, and can be assisted by or affected by a new species
  11. 19. waste-Hazardous waste is waste that has substantial or potential threats to public health or the environment.
  12. 20. the waters on the earth's surface, such as lakes and seas, and sometimes including water over the earth's surface, such as clouds.
  13. 22. rather than biological; not derived from living organisms.