• Cause and Effect 2-1 World Population Growth
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  • How has the population of the world changed in the past 200 years? (D)
    The population of the world increased gradually in the last 200 years and it speeded up during the last century.
  • What natural resources does the Earth have?
    Raw materials found in the nature, such as crude oil, natural gas, stones, minerals, forest, land, animal, water resources.
  • What are the renewable natural resources?
    Renewable natural sources can be replenished at a higher rate than they are consumed. These are: solar, wind, hydro, tidal, geothermical, biomass energy.
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