CSET 118: Earth Resources

Card Set Information

CSET 118: Earth Resources
2013-07-07 17:49:47

Science CSET
Show Answers:

  1. Describe a variety of energy resources, including fossil fuels, nuclear fuels, solar, and biomass
    • fossil fuels: formed from organic remains of plants and animals over very long periods of time 
    • natural gas - occurs naturally in underground reservoirs, a mixture of hyrdocarbons
    • oil - mixture of many types of hydrocarbons and organic compounds
    • coal - formed from peat which formed from plants

    • nuclear reactors: energy comes from the fission of nuclei of uranium or plutonium 
    • cheap and abundant 
    • a slow-moving neutron will lodge into nucleus to break it apart - releasing energy
    • water is heated by reactions - steam generator 
    • produces no greenhouse gases 
    • radioactive waste

    • biomass - organic material from plants and animals, can be burned to release energy in the form of heat 
    • hydropower - moving water can be harnessed to give mechanical energy or electricity 
    • geothermal - heat from within the earth, can heat building or generate electricity 
    • wind - harnessed to give mechanical energy or electricity 
    • solar - radiation from the Sun used directly for heating or converted into electricity
  2. Recognize earth materials as resources (e.g., rocks, minerals, soils, and water)
    • fresh water - low-salt water we can drink or use to irrigate crops
    • groundwater - resides beneath the ground surface, in small spaces around soil or rock particles
    • construction sand and gravel 
    • gold 
    • oil
  3. Identify resources as renewable vs. nonrenewable
    • renewable: can be renewed on a relatively short time scale 
    • biomass 
    • hydropower
    • geothermal 
    • wind
    • solar energy 

    • nonrenewable:
    • fossil fuels
    • nuclear reactors
  4. Compare extraction and recycling in relation to energy, cost, and demand
    • extraction:
    • abundant and inexpensive 
    • cost for extracting oil will eventually become to high, secondary and tertiary methods are expensive

    • recycling:
    • saves energy 
    • reduces emissions of greenhouse gases
    • reduces landfill use
    • reduces extraction of more resources
  5. Explain sustainable uses of resources with respect to utility, cost, human population, and environmental consequences
    • sustainability is meeting our present needs while preserving resources for future generations 
    • to determine if sustainable must consider its effects in relation to: the needs of the people, the protection of the environment and the health of the economy