Unit 2 Planet Earth


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Unit 2 Planet Earth

  2. 2. HOW EARTH MOVES <ul><li>The Earth moves in two ways: rotation and traslation. </li></ul><ul><li>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. </li></ul><ul><li>Revolution: The Earth orbits the Sun. This causes the seasons. </li></ul>
  3. 3. <ul><li>Rotation </li></ul>
  4. 4. <ul><li>Revolution </li></ul>
  5. 5. THE SEASONS <ul><li>The Sun heats the northern hemisphere or the southern hemisphere more strongly depending on the time of year. </li></ul><ul><li>Perihelion : Earth is closest to the Sun. </li></ul><ul><li>Aphelion: Earth is farthest from the Sun. </li></ul><ul><li>The days when seasons change are called equinox and soltice. </li></ul><ul><li>Spring equinox, Summer solstice, Autumn equinox, Winter solstice. </li></ul>
  6. 6. The seasons
  7. 7. ACTIVITIES <ul><li>Where the Sun rise? Where does it set? Why do you think we see it that way? </li></ul><ul><li>True or False? </li></ul><ul><ul><li>The days when the season changes are called ellipse and ecliptic. </li></ul></ul><ul><ul><li>Spring equinox is on 21st June. </li></ul></ul><ul><ul><li>In the northern hemisphere days are longer than nights during winter. </li></ul></ul>
  8. 8. THE MOON <ul><li>The Moon is the Earth’s only satellite. </li></ul><ul><li>Its surface is full of craters . Caused by the impact of meteorites. </li></ul><ul><li>The Moon has two movements: </li></ul><ul><ul><li>Rotation: It takes 28 days. </li></ul></ul><ul><ul><li>Revolution: It orbits the Earth. It takes 28 days. </li></ul></ul><ul><li>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 . </li></ul>
  9. 9. PHASES OF THE MOON <ul><li>The Moon shows 4 different phases: </li></ul><ul><ul><li>New Moon : We cannot see the Moon. </li></ul></ul><ul><ul><li>First Quarter : We can see the right side illuminated. </li></ul></ul><ul><ul><li>Full Moon: We see the whole Moon illuminated. </li></ul></ul><ul><ul><li>Last Quarter: We can see the left side illuminated. </li></ul></ul>
  10. 10. <ul><li>Moon Phases </li></ul>
  11. 11. ECLIPSES <ul><li>An eclipse occurs when a celestial body hides another temporarily. It can be partially or completely. </li></ul><ul><li>Lunar eclipse : It occurs when Earth blocks the Sun's rays from the Moon. </li></ul><ul><li>Solar eclipse : It occurs at New Moon when the Moon passes between Earth and Sun. </li></ul>
  12. 12. <ul><li>Lunar eclipse </li></ul>
  13. 14. THE TIDES <ul><li>The tides are periodic movements of the level of the seas due to the attraction of the Moon and the Sun. </li></ul><ul><li>When the water level rises is called high tide. </li></ul><ul><li>When the water level goes down is called low tide. </li></ul>
  14. 15. ACTIVITIES <ul><li>What do we call the side of the Moon we cannot see? </li></ul><ul><li>Which has more influence on tides, the Moon or the Sun? </li></ul><ul><li>Define: </li></ul><ul><ul><li>Eclipse </li></ul></ul><ul><ul><li>Tide </li></ul></ul><ul><ul><li>Season </li></ul></ul><ul><li>True or false? </li></ul><ul><ul><li>The Earth takes 375 days to orbit the Sun </li></ul></ul><ul><ul><li>The Earth rotates from east to west. </li></ul></ul><ul><ul><li>The Earth goes around the Sun in an elliptical orbit. </li></ul></ul><ul><ul><li>The revolution of the Earth is the movement of the Earth around its own axis. </li></ul></ul>
  15. 16. THE EARTH’S SPHERES <ul><li>The Earth is formed by four spheres: </li></ul><ul><ul><li>The atmosphere : It is formed by a mixture of gases, called air. </li></ul></ul><ul><ul><li>The hydrosphere : is all water on the Earth. </li></ul></ul><ul><ul><li>The geosphere : is the solid part altough it can be viscous. Three layers: crust , mantle and the core . </li></ul></ul><ul><ul><li>The biosphere : is the living things which inhabit the Earth. </li></ul></ul>
  16. 18. <ul><li>ACTIVITIES </li></ul><ul><li>1. Make a drawing of the Earth’s spheres and label them in English and Spanish. </li></ul>