The earth.
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The earth.

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The earth. The earth. Presentation Transcript

  • The Earth. Unit 1.
  • Solar system.The Earth is thethird planet fromthe Sun.It belongs to theso called innerplanets.Its distance fromthe Sun gives itsthe perfecttemperature toallow life, not toohot as Venus nortoo cold as Mars.
  • Earth movements.Rotation: Movementof the Earth around itsaxis.The Earth alwaysrotates towards theeast, as viewed fromthe North Star Polarisit turns counter-clockwise.The rotation takesalmost 24 hours andcauses the succesion ofday and nigth. Click on the Earth and see its moving
  • Earth movements.Rotation: Movementof the Earth around itsaxis.The Earth alwaysrotates towards theeast, as viewed fromthe North Star Polarisit turns counter-clockwise.The rotation takesalmost 24 hours andcauses the succesion ofday and nigth. Click on the Earth and see its moving
  • Earth movements Earth´s orbit. It´s the motion of the Earth around the Sun. It takes 365 days and 6 hours. Every four years they add a day, that year is called leap year. The Earth´s orbit causes the seasons because of the axis tilt.
  • Axial tilt or obliquity Because of the axial tilt the northern hemisphere gets more light and heat in the summer (June) and less in the win te r(De cembe r). In the southern hemisphere it works the other way around.
  • Daylight in different seasons.Spring Summer Tropic of CancerEquator SolsticesEquinoxes Tropic of CapriconrAutunm Winter
  • Geographic coordinates systemThe geographiccoordinatessystem givesus the chanceto locateevery point inthe planet.It´s a net workmade ofparallels andmeridians
  • Equator and parallels. North hemisphere South hemisphereThe Equator is the prime parallel or zero degrees.Look in an atlas and make a list of the equatorial countries
  • Latitude Latitude is the angular distance from the Equator (0º) to any point in the Earth´s surface. It could be north (N) or South (S)Find the latitude of the follow cities, you can look for them in anatlas or in the internet. Oslo, St Petersburg, Paris, Cairo, Quito,Buenos Aires, Sâo Paulo, Cape Town, Mijas.
  • Meridians. A miridian is an imaginary arc that runs from Pole North to Pole South. It gives us the longitude of all the points along the line.The prime meridian was set by the british in theobaser vator y of Greenwich on 1884. Nowadayseverybody calls the meridian after that place nearLondon. Look in an atlas for the contries within thePrime Meridiam.
  • Longitude Longitude is the angular distance bet ween the Prime Meridian to any point in the surface of the Earth. It could be East or West G r e e WEST n EAST w i c h 180º W 0º 180º E Find the longitude of the follow cities, you can look for them in an atlas or in theinternet. Oslo, St Petersburg, Paris, Cairo, Quito, Buenos Aires, Sâo Paulo, CapeTown, Mijas. Now you should have got the coordinates(Lat/Long) of those cities.