Planet earth

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Planet earth

  1. 1. PLANET EARTH
  2. 2. INTRODUCTION Definition: Geography is a social science. Geography is the study of the Earth surface( mountains, deserts, oceans, islands,…), inhabitans and the interaction of humans and their enviroment. Video : introduction to earth science
  3. 3. Key vocabulary
  4. 4. The Universe is everything we can touch, feel, sense, measure or detect. It includes living things, planets, stars, galaxies ... The Universe contains billions of galaxies, each containing millions or billions of stars, satellites and also planets. The Earth Planet belongs to the Solar System which is located in the Milky Way Galaxy . Universe definition:
  5. 5. It is located in the Solar System, which belongs to the Milky Way galaxy. Within the Milky Way there are more than 250 Solar Systems In our Solar System there are eight planets and five dwarf planets. - They have different sizes and satellites revolving around. -All the planets of the Solar System revolve around the Sun. -The orbits on which they revolve are elliptical The planets of the Solar System are: Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune 0. THE UNIVERSE The Earth is the only known inhabited planet
  6. 6.  It is thought that the Universe was created after the Big Bang The cosmic explosion that marked the origin of the Universe  The Earth was formed around 4.5 billion years ago 0. THE UNIVERSE
  7. 7. 2.The Earth is not a perfect sphere because it is flat at poles 4. It is representd with an imaginary axis which goes from pole to pole 3. The surface area of our planet consist of 1. PLANET EARTH Characteristics of our planet 5. There is also an imaginary circle called Equator 70% water 30% land Northern Hemisphere Southern Hemisphere Blue planet 1. The Earth is the third planet from the Sun
  8. 8. • Mild temperature(around 15ºC average). 1. • Liquid water 2. • Atmosphere avoids excessive cooling and heating It filters the harmful solar radiations 3 Life can exist on the Earth thanks to:
  9. 9. The Earth has two kinds of movements •The earth rotates on its axis It moves from west to east •It takes 24 hours •Consequence: Succession of days and nights •Our planet moves around the sun (at 30 km/sec following its elliptical orbit) •It takes 365 days and 6h. •Every four years : leap year •Consequences: a)The seasons b)Equinoxes and solstices c)Eclipses 2. MOVEMENTS OF THE EARTH
  10. 10. Video learn gradeEarth rotation video
  11. 11. Video why do we have seasons? a) Seasons
  12. 12. b) Equinoxes and solstices • The Sun is vertical to the equator • Day and night have the same duration across the world • There are two equinoxes during the year: EQUINOX • The Sun falls vertically on one hemisphere • In one hemisphere is summer and in the other is winter. SOLSTICE
  13. 13. c) Eclipses
  14. 14. 3. LINES AND GEOGRAPHIC COORDINATES Imaginary lines Parallels • Infinites • East- West • They are numbered from 0º to 90º • Parallel 0º is Equator • Other important parallels:Tropic of Cancer,Tropic of Capricorn, Artic Circle and Antartic Circle. Meridians • Infinites • North- South • They are numbered from 0º to 180º • Prime meridian or 0º : Greenwich
  15. 15. 3. LINES AND GEOGRAPHIC COORDINATES Latitude and Longitude • Distance between any point and the Equator • Noth –south • Maximun value 90º • Mesured in degrees Latitude • Distance betwwen any point and Greenwich meridian • East- West • Maximun value 180º • Measured in degrees Longitude
  16. 16. TIME ZONES There are 24 Times zones The time uses as a reference is called GMT If we move westwards, clocks go back If we move eastwards, clocks move forward 4. TIMES ZONES
  17. 17. 5. REPRESENTATIONS OF THE EARTH AND MAPS CYLINDRICAL • Rectangular proyection • It represents the whole world PLANAR • Circular proyection • It represents the poles and sorroundings CONICAL • Fan-shaped proyection • It represents the middle latitudes 5.1 cartographic projections
  18. 18. 5.2 Maps Map: • Representation on a plane of part of the Earth´s surface Cartography: • Art of making maps and the science of their study
  19. 19. CARTOGRAPHY REMOTE SENSING AERIAL PHOTOGRAPHY SPACE IMAGES uses uses
  20. 20. Space images
  21. 21. 5.3 Map scale DEFINITION: Proportion between an area represented on a map and the real size of the area. SCALE SIZE SMALL SCALE LITLE DETAILED LARGE SCALE VERY DETAILED TWO TYPES NUMERICAL LINEAR OR GRAPHIC
  22. 22. NUMERICAL SCALE NUMERICAL SCALE LINEAR SCALE LINEAR SCALE

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