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Chapter 12 Geo
Human Impact on the Environment
Question | Answer |
---|---|
What is ecology? | The study of how organisms interact with one another and with their physical environment |
What is the biosphere? | A think film of air, water, and earth within which we live |
What is the troposphere? | The lowest layer of the earth's atmosphere that goes up to seven miles above the earth |
What is the hydrosphere? | It includes the surface and subsurface water on/in the earth (icluding glaciers and water trapped in the ice/earth) |
What is the lithosphere? | The soils of the earth supporting plant and animal life |
What is a food chain? | A sequence of organisms through which energy and materials move within an ecosystem |
What is the "IPAT"equation (I=PAT)? | Impact on environment = population x affluence x technology factor |
What is the hydrologic system? | The system by which water is continuously circulated through the biosphere and changes form |
What is desalization and why is it important? | The cleansing of water of seawater of its salt and mineral content so it can be used as a possible solution for the scarcity of water supply |
What is Euthrophication? | the enrichment of water by nutrients |
What is a point source? | Enters the environment at specific sites such as sewage treatment facilities or industry discharge pipes |
What is a non-point source? | They enter the environment in a more diffuse way making it more difficult to control such as runoffs from agricultural fields and road salts |
What makes air polluted? | When air contains substances in sufficent concentrations to have a harmful effects on living things |
What are some natural air pollutants? | Volcanic ash, marsh gases, and smoke from forest fires |
What are some unnatural air pollutants? | The most common is the burning of fossils fuels such as carbon dioxide, carbon monoxide, hydracarbons, nitrate oxides, particulates, and sulfar oxides |
What are chlorofluorocarbons (CFCs)? | The most significant chemicals that destroy the ozone layer and includes halons, carbontetrachloride, and methyl chlorofoam and are found in refridgerators, A/C, spray cans, and hundreds of other products |
What is surface mining? | It involves the removal of vegetation, top soil, and rocks from the earth's surface in order to get resources underneath |
What is strip mining? | A trench is dug, the material is excavated, another is dug and the waste from this trench goes into the first |
What is leachate? | Chemically created drainage from landfills that contaminates groundwater (can be organic or nonorganic) |
What is low-level radioactive waste? | It stays radioactive for less than 100 years and its sources include nuclear powe plants, industries, research establishments, universities, and hospitals |
What is high-level radioactive waste? | It can remain radioactive for over 10,000 years |
what is civilian waste? | (High-level waste) primarily spent fuel assemblies of nuclear reactors |
What is military waste? | (High-level waste) By-product of manufacture of nuclear weapons |