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

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

  • Ch. 17 Lesson 1 How does Earth move?
  •  
  • clues that Earth is moving:
    • Sun & stars seem to move across sky
    • change of seasons
  • Why can’t you feel Earth’s movement?
    • Earth moves steadily & smoothly
  • axis
    • imaginary line that runs thru. North Pole  Earth’s ctr.  South Pole
  • tilt of Earth’s axis
    • causes seasons to change
  •  
  • The Earth's Tilt on Its Axis and the Seasons [02:15]
  • rotation
    • spinning motion of Earth on its axis
    rot a tion x i s
  • rotation
    • 23 hours & 56 min.
  • rotation
    • causes day & night
    • Earth rotates from west  east
    Earth's rotation animation
  • revolution
    • movement of one object around another
    Rotation-Revolution animation
  • Rotation & Revolution
  • The Movement of the Earth [04:18]
  • orbit
    • path Earth takes as it revolves around Sun
    • Force of gravity keeps Earth in its orbit.
  • ellipse (elliptical)
    • Shape of Earth’s orbit
    • Stretched out circle (oval)
  •  
  • Rotation and Revolution quiz
    • 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?