What is a natural resource? 
  Natural means it is found in nature and is not man made
  Resource are materials or substances that can be used for economic gain 
  All natural resources are either renewable or non-renewable
  Natural resources can be used to form energy
  Energy is power from resources-can provide light & heat, transportation, to 
  make machines work, and other needs
  18.1 Energy Resources 
  Nonrenewable: used faster than they can be replaced naturally-coal, oil, 
  uranium 
  Renewable: replaced naturally in a short amount of time-sun, wind, water
  Nonrenewable resources tend to be more expensive
  Chart p. 643
  Fossil Fuels
  Nonrenewable; forms over millions of years; remains of animals & plants
  Uses extreme temperatures and pressure to change buried dead plants & 
  animals into resources like coal, oil, petroleum, and natural gas
  3 Factors determine the type of fossil fuel: type of organic matter, amount of 
  pressure and temperature, and length of time buried
  Organic means made naturally
  Coal
  Fossil fuel- bacteria, temps & pressure acted on dead plants to form peat
  Peat can be used as a fuel when burned
  Peat can also change into harder types of coal like anthracite 
  Coal mines provide many jobs and help our economy grow
  Pics p. 644
  Oil & Natural Gas
  Fossil fuel-bacteria, temps & pressure acted on plankton for millions of years 
  to form natural gas.  Plankton are microscopic marine organisms. 
  Rock layers in the mantle of the Earth provide permeable rocks for less dense 
  gas and oil to pass. Permeable refers to holes in rocks that a substance can 
  pass through. Impermeable means nothing can pass through. 
  Pic p. 645