INDEX. CONCEPTUAL MAP. LA TIERRA. 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.
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
3 DWARF PLANETS: PLUTO, CERES and ERIS Other celestial bodies: ASTEROIDS, COMETS, SATELLITES
The Solar System is made up of. • The INNER PLANETS: • Mercury • Venus • EARTH • Mars • These four planets are the closest to the SUN. • The OUTER PLANETS: • Jupiter • Saturn • Uranus • Neptune • The inner planets are separated from the outer planets by the Asteroid Belt.
WATER IN MARS OLYMPUS MONS
They are small bodies of rock and metal that orbit the Sun. • ASTEROID BELT: It separates inner planets from outer planets.
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 itssizewiththerest of thePlanetsfromthepicture.
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. Theconsequenceswillbeexplainedlater.
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 thedistribution of thelands and oceansoneachhemisphere and explainthediferences. In whichhemisphereisSpain?
Meridians and parallels System of geographical coordinates. Does the Greenwich Meridian go across Spain? • 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.
RESEARCH THE EARTH MOVEMENTS THE EARTH MOVEMENTS
Earthmovementonits axis. • Lenght: 24 Hours. • Movementdirection: TheEarthrotatesfromwesttoeast. • Consequences: Succession of days and nights.
TIME ZONES • The Earth is divided into 24 time zones. • Each time zone measures 15º. • All the places located in the same time zone have the same time.
MOVEMENTS OF THE EARTH TRANSLATION
TRANSLATION Movement of the Earth around the Sun. • Duration: 1 solar year: 365 days 6 hours 9 minutes 6 hours x 4 = 24 hours-> 1 day ->every 4 years 366 days = leap year
CONSEQUENCES a) TheEarthtilt tiltedrotation axis Thetwopoles exposedalternatively toradiation “midnightsun”
Reinforcement Activity • Draw a conceptual map with the seasonal situation in the South Hemisphere.
KEY WORDS • EQUATOR • HEMISPHERE • ROTATION • EARTH • ORBIT • PLANET • SATELLITE • TIME ZONE • SOLAR SYSTEM • MILKY WAY
Mª Isabel Alvarez Pilar Bragado Elvira Cañibano Rosario García Teresa García Teresa Pérez Rosa Mª Ríos Esther Sánchez