environmental systems
Across
- 4. a substance that is toxic to plants, used to destroy unwanted vegetation.
- 7. the action or process of adapting or being adapted.
- 12. prevention of wasteful use of a resource.
- 13. the process by which fertile land becomes desert, typically as a result of drought, deforestation, or inappropriate agriculture.
- 14. is waste that is dangerous or potentially harmful to our health or the environment.
- 15. 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.
- 16. A species that normally lives and thrives in a particular ecosystem.
- 17. a term describing the relational position of a species or population in an ecosystem. ... According to the competitive exclusion principle, no two species can occupy the same niche in the same environment for a long time.
- 18. the weather conditions prevailing in an area in general or over a long period.
- 20. the variety of life in the world or in a particular habitat or ecosystem.
- 22. an area or ridge of land that separates waters flowing to different rivers, basins, or seas.
- 23. a biological community of interacting organisms and their physical environment.
- 24. a large natural or artificial lake used as a source of water supply.
- 25. involves the management and modification of natural environment or wilderness into built environment such as settlements and semi-natural habitats such as arable fields, pastures, and managed woods.
Down
- 1. the action of preserving something.
- 2. physical rather than biological; not derived from living organisms.
- 3. 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.
- 5. 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.
- 6. refers to the range of habitats present in a region.
- 8. avoidance of the depletion of natural resources in order to maintain an ecological balance.
- 9. a substance used for destroying insects or other organisms harmful to cultivated plants or to animals.
- 10. the dependence of two or more people or things on each other.
- 11. a large naturally occurring community of flora and fauna occupying a major habitat, e.g. forest or tundra.
- 19. relating to or resulting from living things, especially in their ecological relations.
- 21. a substance used for killing insects.