Unit 2 Planet Earth
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Unit 2 Planet Earth

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Unit 2 Planet Earth Presentation Transcript

  • 1. UNIT 2:PLANET EARTH
  • 2. HOW EARTH MOVES
    • The Earth moves in two ways: rotation and traslation.
    • 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 the seasons.
  • 3.
    • Rotation
  • 4.
    • Revolution
  • 5. THE SEASONS
    • The Sun heats the northern hemisphere or 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 called equinox and soltice.
    • 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 when the 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 Earth’s only satellite.
    • Its surface is full of craters . 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 called the 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
    • An eclipse occurs 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 : It occurs at New Moon when the Moon passes between Earth and Sun.
  • 12.
    • Lunar eclipse
  • 13.  
  • 14. THE TIDES
    • The tides are periodic movements of the level of the seas due to the attraction of the Moon and the Sun.
    • When the water level rises is called high tide.
    • When the water level goes down is called low tide.
  • 15. ACTIVITIES
    • What do we call the side of the Moon we 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 EARTH’S 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 , mantle and the core .
      • The biosphere : is the living things which inhabit the Earth.
  • 17.  
  • 18.
    • ACTIVITIES
    • 1. Make a drawing of the Earth’s spheres and label them in English and Spanish.