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How earth moves g3
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- 2. Ch.8 Lesson 4 HowEarth Moves • ( Objectives ) • The student be able to : • 1-Explore and make a model of Earth to show how sun shines on it. • 2-Understand that Earth rotates on its axis and this cause day and night. • 3-Understand that Earth revolution causes the seasons. (Vocabulary): sphere Rotates Axis Revolve Orbit 2
- 3. Ch.8 Lesson 4 HowEarth Moves What causes Day and Night? • It seems as if the Sun is always moving across the sky. • It looks as if the Sun rises in the East and sets in the West. • But The Sun doesn’t move. (Vocabulary): sphere Rotates Axis Revolve Orbit 3
- 4. Ch.8 Lesson 4 HowEarth Moves * Earth is shaped like a ball. This shape is called a sphere • Earth rotates = turn • Earth rotation causes day and night. (Vocabulary): sphere Rotates Axis Revolve Orbit 4
- 5. Ch.8 Lesson 4 HowEarth Moves • As Earth rotates, there is daylight where Earth faces the Sun. • And darkness where Earth is turned away from the Sun. (Vocabulary): sphere Rotates Axis Revolve Orbit 5
- 6. Ch.8 Lesson 4 HowEarth Moves It takes 24 hours for Earth to make one complete rotation. one complete rotation= 1 day A day is made up of hours of light + hours of dark. (Vocabulary): sphere Rotates Axis Revolve Orbit 6
- 7. Ch.8 Lesson 4 HowEarth Moves Earth spins or rotates around its axis. is an imaginary line through the center of Earth From the North pole to the South pole. * It is slightly Tilted. (Vocabulary): sphere Rotates Axis Revolve Orbit 7 axis
- 8. Ch.8 Lesson 4 HowEarth Moves The tilt of Earth changes how the Sun’s rays strike the surface. • At the poles the Sun stays low in the sky during the day the Sun’s rays are weak it is cold • At the equator the Sun rises high in the sky the Sun’s rays are stronger • Temperature is higher. (Vocabulary): sphere Rotates Axis Revolve Orbit 8
- 9. Ch.8 Lesson 4 HowEarth Moves What causes Seasons? • Earth also revolves around the Sun. when an object moves around another object. (Vocabulary): sphere Rotates Axis Revolve Orbit 9 revolves
- 10. Ch.8 Lesson 4 HowEarth Moves Earth travels in a regular path called orbit is the path that an object follows as it revolves around another object. It takes 365 ¼ days for Earth to make 1 complete revolution around the Sun. (Vocabulary): sphere Rotates Axis Revolve Orbit 10 Orbit
- 11. Ch.8 Lesson 4 HowEarth Moves In many parts of the world, the year made up of 4 seasons. Why? Because of the Earth’s tilted axis. (Vocabulary): sphere Rotates Axis Revolve Orbit 11
- 12. Ch.8 Lesson 4 HowEarth Moves * Having a tilted axis means Earth slants a little as it revolves around the Sun. • Earth is always tilted in the same direction. • As Earth travels around the Sun, the part tilted toward the Sun changes. • (Vocabulary): sphere Rotates Axis Revolve Orbit 12
- 13. Ch.8 Lesson 4 HowEarth Moves When the North pole tilted toward the Sun the Sun travels higher in sky . It is Summer. When the North pole tilted away from the Sun the Sun travels lower in sky . It is Winter (Vocabulary): sphere Rotates Axis Revolve Orbit 13
- 14. Ch.8 Lesson 4 HowEarth Moves What about Fall and Spring?. The North Pole is tilted neither toward nor away from the Sun.(Vocabulary): sphere Rotates Axis Revolve Orbit 14
- 15. Ch.8 Lesson 4 HowEarth Moves How Does the Sun’s Path in the Sky Change ? During the Summer your part of Earth tilted toward the Sun The Sun’s path appears higher in the sky. During the Winter your part of Earth tilted away from the Sun The Sun’s path appears lower in the sky. (Vocabulary): sphere Rotates Axis Revolve Orbit 15
- 16. Ch.8 Lesson 4 HowEarth Moves The Sun in the Summer and Winter Skies: (Vocabulary): sphere Rotates Axis Revolve Orbit 16
- 17. Ch.8 Lesson 4 HowEarth Moves ( Check for Understanding) 1-Describe the motion of Earth that makes 1 day. 2-What would happen to the seasons if Earth’s axis is not tilted? 3-How are rotation and revolution are different? (Vocabulary): sphere Rotates Axis Revolve Orbit 17
- 18. 18 Rotating Revolving Moving ofEarth around itself through its axis. Moving of Earth in its orbit around the Sun. It takes 24 hours or 1 day It takes 365 ¼ days or 1 year It causes day and night. It causes the 4 seasons.