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2014-09-17 20:54:04
Science terms

Use to study for science tests
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  1. Ecosystem
    All the interacting parts of a biological community and that communities environment
  2. Sustainable Ecosystem
    An ecosystem capable of withstanding pressure and giving support to a variety of organisms
  3. Biotic
    Anything that is alive or has ever been alive
  4. Abiotic
    Physical rather than biological; not derived from any living organisms  (eg rocks, soil)
  5. Lithosphere
    Hard part of earths surface; includes rock and soil
  6. Hydrosphere
    Liquid part of earths surface; includes salt water oceans, freshwater lakes, rivers)
  7. Atmosphere
    Layer of gasses above earths surface, includes air
  8. Biosphere
    Living part of earths surface, separate from other abiotic spheres, includes life in soil, water and air
  9. Nutrients
    Chemicals that are needed by living organisms to survive (eg calcium)
  10. Eutrophication
    the process of adding nitrogen or phosphorus to an ecosystem that pushes it beyond the natural cycle and beyond sustainability
  11. Photosynthesis
    the conversion of solar energy to chemical energy used as 'food'

    • Carbon dioxide+water
    • (in the presence of sunlight)
    • (chlorophyll is needed)
    • oxygen+glucose
  12. Trophic Levels
    Categories of organisms defined  by how the organisms gain energy
  13. Biomass
    The total mass of living organisms in a defined group area
  14. Trophic Efficiency
    A measure of the amount of energy or biomass transferred from one trophic level to the next higher trophic level
  15. Bioaccumulation
    A process in which materials, especially toxins, are ingested by organisms at a faster rate than they can be eliminated
  16. Biomagnification
    The increase in the concentration of a toxin as it moves from one trophic level to the next
  17. Cellular Respiration
    The breakdown of glucose in the presence of oxygen to produce cellular energy
  18. Fermentation
    Used by bacteria and some fungi to release the energy in glucose. It occurs when oxygen is absent (anaerobic conditions)
  19. Greenhouse Gasses
    Includes carbon dioxide, water and methane, which trap some of the energy of the sun that would otherwise escape
  20. The Greenhouse Effect
    This is when  greenhouse gasses form a barrier that traps sunlight in the earths atmosphere, which causes global warming
  21. Acid Precipitation
    The burning of fossil fuels releases nitrogen oxide and sulfur dioxide. These gasses combing with water particles to form nitric acid and sulfuric acid. These acids have a lower pH than normal rainwater (can go as low as 4.2 pH). They travel through the water cycle, and eventually fall as acid precipitation.