INDEX THE SOLAR SYSTEMPLANET EARTH ROTATION OF THE EARTH: DAYS AND NIGHTS REVOLUTION OF THE EARTH: SEASONS OF THE YEAR KEY WORDS
UNIVERSE It is made up of GALAXIES MILKY WAY Contains the SOLAR SYSTEM SUNPLANETSSATELLITESASTEROIDSOthers PLANETS OUTER PLANETS MERCURY VENUS EARTH MARS INNER PLANETS JUPITER SATURN URANUS NEPTUNE DWARF PLANETS CONCEPTUAL MAP
It is made up of millions of GALAXIES. Our galaxy is called THE MILKY WAY. Milky Way is a spiral- shaped galaxy. Our Solar System is located in one of the spirals. GALAXIES: They are concentrations of billion of stars held together by gravitational attraction
The Solar System is made up of. – The INNER PLANETS: The INNER PLANETS: Mercury Venus EARTH Mars – These four planets are the closest to the SUN. – The OUTER PLANETS: The OUTER PLANETS Jupiter Saturn Uranus Neptune – The inner planets are separated from the outer planets by the Asteroid Belt.
THE PLANETS CLICK ON THE NAME OF THE PLANET TO SEE SOME IMAGES
It is the third inner Planet of the SOLAR SYSTEM. It is called BLUE PLANET. Guess the reason.
The Earth has a surface of 510.000.000 km2. (1000 times Spain’s surface). Compare its size with the rest of the Planets from the picture.
It is not a perfect sphere, it is flatted on the poles, because its north-south diametre is shorter than its east-west diametre. It is said that it has a geoid shape. The elipsoid used to represent it has a maximum diametre of 12.756.776 km, and the minimum diametre of 12.713.824 km.
The Earth is tilted 23º 27’ respect to the vertical axis. The consequences will be explained later.
The Earth is divided in two halves, called hemispheres, by an imaginary line called Equator. The NORTH HEMISPHERE, called boreal or northern hemisphere, has more underwater lands than the south emisphere. The SOUTH HEMISPHERE is the one which has the most surface covered by water, it is also called austral or meridional hemisphere.
Activity Observe the distribution of the lands and oceans on each hemisphere and explain the diferences. In which hemisphere is Spain?
Meridians and parallels In order to measure the Earth surface several imaginary lines have been drawn. From West to East, the PARALLELS, the main is called EQUATOR and the secondaries are the TROPICS and POLAR CIRCLES. From North to South, the MERIDIANS, the main one is called 0º MERIDIAN or GREENWICH MERIDIAN. System of geographical coordinates. Does the Greenwich Meridian go across Spain?