DO YOU KNOW THAT…• Pluto is not a planet anymore?• The Solar System is 4.6 billion years old!• All the objects in the Solar System orbit the Sun in a counter-clockwise direction.• The Sun is just one star in 200 billion in the Milky Way! So are there really aliens on the other planets?
DESCRIBE THE EARTH• rd It is the 3 planet in the solar system• It is about 150 million km from the sun• The earth is the only planet that sustains life because it has WAFT
THE EARTHS MOVEMENT : (1)ROTATION • Describe rotation: • Earth rotates on its own axis in a west-east direction • One complete rotation takes 24 hours • Effects: • Results in Day and Night
THE EARTHS MOVEMENT : (2)REVOLUTION• Describe revolution: • Earth tilts at an angle of 23.5 degrees to the plane of its orbit • Earth revolves around the sun along an orbit • One complete revolution takes 365.25 days
THE EARTHS MOVEMENT : (2)REVOLUTION• Effects • Revolution and the tilt of the Earth results in 4 seasons • Revolution and the tilt of the Earth also results in different places on Earth experiencing different lengths of day and night
WHY LIFE IS POSSIBLE ON EARTH?Elements PurposeWATER Humans, animals and plants need water to grow and survive.AIR All living things require oxygen for respiration.FOOD It is our source of energy to sustain our lives.TEMPERATURE Suitable temperature is needed for all species to survive. We Are Fortunate Today!
SUMMARY• Solar system comprise of the sun and 8 planets• Life is possible on earth because of WAFT• The earth rotates on its own axis and revolves around the sunADDITIONAL RESOURCES• http://nineplanets.org/• http://www.bbc.co.uk/science/space/solarsystem/• http://www.classzone.com/books/earth_science/terc/content/investigations/esu701/esu