• Gases, water, rock, and living organisms are all found at Earth's surface.
  • These materials are also found above or below the surface.
  • They interact with each other and in doing so alter each other.
  • Earth has four layers: atmosphere, hydrosphere, biosphere, and lithosphere.
  • All of Earth’s layers interact.
  • Therefore, Earth”s surface is constantly undergoing changes.
  • Use the resource below to answer the questions that follow: What are the four major systems of Earth?
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