AP (Advanced Placement) Human Geography Key Geography Concepts Study Material (Page 3 of 73)

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Common Terms

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  • Graticule: Network of lines that depict selection of earth՚s parallels and meridians.
  • Great Circle: Circle made on surface of a sphere by a plane passing through center of sphere. Equator, each meridian, and each full circumference circle on earth makes a great circle. Arc of a great circle represents shortest distance between points on earth՚s surface.
    • A meridian is a great circle on earth՚s surface that touches geographical poles and some third point on earth՚s surface. All points on given meridian ha…

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Rotation and Revolution

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  • Rotation: It is the movement of earth on its axis. Earth takes 24 hours to complete one rotation on its axis and this is called an earth day. Rotation of earth causes day and night.
  • Revolution: Movement of earth around sun in a specified path or orbit is revolution. Earth takes days (one year) to revolve around sun.
  • Orbital Plane: It is the plane made by the orbit (of any celestial body) .
  • Axis: It is an imaginary line making an angle of with Earth՚s o…

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