4th Grade-Ch. 17 Lesson 1 How does Earth move

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4th Grade-Ch. 17 Lesson 1 How does Earth move

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

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