Earth Resources

  * Modern technology depends on energy resources and materials found on Earth.
  * Economic and environmental issues can influence the choice of resources.
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Topics

  * Metals are typically found as part of a chemical compound.
  * Carbon compounds can be combined into long-chain molecules called polymers.
  * Some materials are naturally radioactive, and others can be made radioactive.
  * Maximizing the value of natural resources requires attention to "The Three Rs".
  * Energy is a quantity that can be found, but never created.