unit 2 planet earth

Download Unit 2 Planet Earth

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  • 1.UNIT 2:PLANET EARTH

2. HOW EARTH MOVES

  • The Earth moves in two ways:rotationandtraslation.
  • Rotation:Movement of the Earth around its own axis. It causes night and day. The Sun rises in the east and sets in the west.
  • Revolution:The Earth orbits the Sun. This causes theseasons.

3.

  • Rotation

4.

  • Revolution

5. THE SEASONS

  • The Sun heats the northernhemisphereor the southern hemisphere more strongly depending on the time of year.
  • Perihelion : Earth is closest to the Sun.
  • Aphelion:Earth is farthest from the Sun.
  • The days when seasons change are calledequinoxandsoltice.
  • Spring equinox, Summer solstice, Autumn equinox, Winter solstice.

6. The seasons 7. ACTIVITIES

  • Where the Sun rise? Where does it set? Why do you think we see it that way?
  • True or False?
    • The days whenthe season changes are called ellipse and ecliptic.
    • Spring equinox is on 21st June.
    • In the northern hemisphere days are longer than nights during winter.

8. THE MOON

  • The Moon is the Earths only satellite.
  • Its surface is full ofcraters . Caused by the impact of meteorites.
  • The Moon has two movements:
    • Rotation: It takes 28 days.
    • Revolution: It orbits the Earth. It takes 28 days.
  • We always see the same side of the Moon because rotation and revolution take the same time. The other side is calledthe hidden side .

9. PHASES OF THE MOON

  • The Moon shows 4 different phases:
    • New Moon : We cannot see the Moon.
    • First Quarter : We can see the right side illuminated.
    • Full Moon:We see the whole Moon illuminated.
    • Last Quarter:We can see the left side illuminated.

10.

  • Moon Phases

11. ECLIPSES

  • Aneclipseoccurs when a celestial body hides another temporarily. It can be partially or completely.
  • Lunar eclipse :It occurs when Earth blocks the Sun's rays from the Moon.
  • Solar eclipse : Itoccurs at New Moon when the Moon passes between Earth and Sun.

12.

  • Lunar eclipse

13. 14. THE TIDES

  • Thetidesare periodic movements of the level of the seas due to the attraction of the Moon and the Sun.
  • When the water level rises is calledhigh tide.
  • When the water level goes down is calledlow tide.

15. ACTIVITIES

  • What do we call the side of the Moonwe cannot see?
  • Which has more influence on tides, the Moon or the Sun?
  • Define:
    • Eclipse
    • Tide
    • Season
  • True or false?
    • The Earth takes 375 days to orbit the Sun
    • The Earth rotates from east to west.
    • The Earth goes around the Sun in an elliptical orbit.
    • The revolution of the Earth is the movement of the Earth around its own axis.

16. THE EARTHS SPHERES

  • The Earth is formed by four spheres:
    • The atmosphere : It is formed by a mixture of gases, called air.
    • The hydrosphere : is all water on the Earth.
    • The geosphere : is the solid part altough it can be viscous. Three layers:crust ,mantleand thecore .
    • The biosphere : is the living things which inhabit the Earth.

17. 18.

  • ACTIVITIES
  • 1. Make a drawing of the Earths spheres and label them in English and Spanish.