Across
- 2. when these gases react in the atmosphere with water, oxygen, and other chemicals to form various acidic compounds.
- 4. describes a lifestyle that attempts to reduce an individual's or society's use of the Earth's natural resources, and one's personal resources.
- 7. is indigenous to a given region or ecosystem if its presence in that region is the result of only natural processes, with no human intervention.
- 9. is the geological process in which sediments, soil and rocks are added to a landform or landmass.
- 12. a continuous series of natural processes by which nitrogen passes successively from air to soil to organisms and back to air or soil involving principally nitrogen fixation, nitrification, decay, and denitrification.
- 14. relating to or resulting from living things, especially in their ecological relations.
- 16. occurs when there is more water than land can absorb. The excess liquid flows across the surface of the land and into nearby creeks, streams, or ponds.
- 18. is a pesticide used to kill unwanted plants. they kill certain targets while leaving the desired crop relatively unharmed. Some of these act by interfering with the growth of the weed and are often based on plant hormones.
- 22. 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.
- 23. is any substance that occupies space and has mass.
- 25. prevention of wasteful use of a resource.
- 26. The waste water from domestic, commercial and industrial sources carried by sewers. Waste matter carried away in sewers or drains. Human waste, often toxic to many organisms which can be treated in a variety of ways to eliminate its dangerous components.
- 27. An eating away, destruction of the surface of a tissue, material or structure, Progressive loss of the hard substance of a tooth by chemical processes that do not involve bacterial action.
Down
- 1. 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.
- 3. They can harm the environment, the economy, or even human health.
- 5. the action or process of adapting or being adapted.
- 6. physical rather than biological; not derived from living organisms.
- 8. biological community of interacting organisms and their physical environment.
- 10. is stored in rocks and sediments, while the rest is stored in the ocean, atmosphere, and living organisms.
- 11. caused by plants and animals. Plants and animals release acid forming chemicals that cause weathering and also contribute to the breaking down of rocks and landforms.
- 13. the variety of life in the world or in a particular habitat or ecosystem.
- 15. processes occurs when any process is modulated in its frequency, rate or extent. Biological processes are regulated by many means; examples include the control of gene expression, protein modification or interaction with a protein or substrate molecule.
- 17. is all of the food chains in an ecosystem. Each organism in an ecosystem occupies a specific trophic level or position in the food chain or web.
- 19. A chemical used to kill insects. Substances that are capable of killing insects, used by humans to those who are considered pests.
- 20. is a collection of plants and animals that have common characteristics for the environment they exist in. They can be found over a range of continents.
- 21. the weather conditions prevailing in an area in general or over a long period.
- 24. The change in the environment caused by natural or artificial input of harmful contaminants into the environment, and may cause instability, disruption or harmful effects to the ecosystem