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  • 1. Ch. 17 Lesson 1 How does Earth move?
  • 2.  
  • 3. clues that Earth is moving:
    • Sun & stars seem to move across sky
    • change of seasons
  • 4. Why can’t you feel Earth’s movement?
    • Earth moves steadily & smoothly
  • 5. axis
    • imaginary line that runs thru. North Pole  Earth’s ctr.  South Pole
  • 6. tilt of Earth’s axis
    • causes seasons to change
  • 7.  
  • 8. The Earth's Tilt on Its Axis and the Seasons [02:15]
  • 9. rotation
    • spinning motion of Earth on its axis
    rot a tion x i s
  • 10. rotation
    • 23 hours & 56 min.
  • 11. rotation
    • causes day & night
    • Earth rotates from west  east
    Earth's rotation animation
  • 12. revolution
    • movement of one object around another
    Rotation-Revolution animation
  • 13. Rotation & Revolution
  • 14. The Movement of the Earth [04:18]
  • 15. orbit
    • path Earth takes as it revolves around Sun
  • 16.
    • Force of gravity keeps Earth in its orbit.
  • 17. ellipse (elliptical)
    • Shape of Earth’s orbit
    • Stretched out circle (oval)
  • 18.  
  • 19. Rotation and Revolution quiz
  • 20.
    • 1. What is an axis? 
    • 2. The Earth _____around the Sun.
    • 3. The Earth _____on its axis.
    • 4. Does the Earth rotate and
    • revolve at the same time?
    • Explain your answer.
    • 5. How would Earth be affected if
    • its axis weren’t tilted?