2. Earth and Other Planets Moving in Space Module A Chapter 1 Grade 4

3. Moving Earth Revolution: One full orbit (time) around the sun. One revolution takes 1 year Rotation: Earth spinning on its axis. One rotation is called a day. When ½ the earth is dark, the other ½ is light because of the earth’s rotation. = =

4. The Force of Gravity Gravity █Can’t see it or touch it. always present █The greater the distance between 2 objects, the weaker the force of gravity █The closer the distance between 2 objects, the stronger the force of gravity between them. Mass  The amount of matter an object contains is it’s mass.  The greater the mass between 2 objects the greater the force of gravity between them.

5. Gravity & Mass The force that pulls the moon around the Earth is called gravity. The moon orbits the Earth because of the pull of gravity. The Earth moves easily around the sun because the Earth has less mass. The sun and Earth are called a system because they work together.

6. Eclipse Lunar Eclipse A lunar eclipse occurs when the Earth blocks sunlight from reaching the moon. Solar Eclipse A solar eclipse occurs when the moon blocks sunlight from reaching Earth.

7. The Earth spins around on its: rotation? Revolution? Axis?

8. Axis

9. The Earth goes around the…. Milky Way Orbits Sun

11. What occurs when the Earth blocks sunlight from reaching the moon? A rotation? A revolution? A lunar eclipse?

12. Lunar Eclipse!

13. Earth moves more easily than the sun because Earth has less People Force Planets Mass

15. One rotation of the Earth is a Century Day Month Year

16. day

17. The moon moves in a curved orbit around the Earth because of……. Force Gravity Solar eclipse

18. Gravity

19. The shape of the moon at night that we see depends on…. The moon’s position as it orbits Earth The position of the sun and the moon The moon’s spin

20. The moon’s position as it orbits Earth

21. Which describes a solar eclipse? The moon blocks sunlight from reaching the earth. The Earth blocks sunlight from reaching the moon.

22. The moon blocks sunlight from reaching the Earth.