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A general circulation model solves

  • A.the equations of motion on a global grid
  • B.a single energy balance for the whole planet
  • C.statistical relations fitted to the past data
  • D.no equations of any kind at all

Answer: A

The primitive equations are integrated forward in time on a three dimensional grid. Simpler models in the hierarchy do use energy balance equations, but they answer different questions. A grid is what makes it three dimensional.

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