Sun

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Sun

  1. 1. The Sun (the kids’ section) TQ Team C0112425 2001
  2. 2. The Sun <ul><li>In this chapter we will talk about </li></ul><ul><li>The Role of the Sun </li></ul><ul><li>Effect on Weather </li></ul><ul><li>The snug Earth </li></ul><ul><li>Solar Power </li></ul><ul><li>Why do we have temperature </li></ul><ul><li>How do we measure air temperature? </li></ul>
  3. 3. The Sun’s Role <ul><li>The Sun is the ultimate source of heat energy of the earth. </li></ul><ul><li>All the Earth’s heat and light comes from the Sun. </li></ul>
  4. 4. Life Support <ul><li>The Sun keeps the temperature of most of the Earth’s surface at 51 to 49 degrees Celsius. </li></ul><ul><li>For most living things can only survive at 0 to 49 degrees Celsius. </li></ul><ul><li>If the amount of sunlight reaching the Earth was cut by one tenth, the oceans would turn to ice and like on Earth would die. </li></ul>
  5. 5. Effect on Weather <ul><li>The Sun is the key to the world’s weather. </li></ul><ul><li>Its rays filter through the atmosphere and warm the Earth’s surface which heats the air above. This makes the air move because warm air rises. </li></ul><ul><li>The movement of air causes winds which lead to weather changes. </li></ul>
  6. 6. The Snug Earth <ul><li>The Earth absorbs sunlight and then releases it into the air again as heat. </li></ul><ul><li>The heat is trapped by water vapour and clouds in the atmosphere and reflected back to Earth. </li></ul><ul><li>The atmosphere acts like an enormous blanket around the Earth, keeping the warmth. </li></ul>
  7. 7. Solar Power <ul><li>Solar panels are used to collect the Sun’s heat. </li></ul><ul><li>Water in them absorbs the heat and is used to warm homes. Electricity can also be made from sunlight. </li></ul>
  8. 8. Why do we have air temperature? <ul><li>Air temperature tells us how hot or how cold the air is. </li></ul><ul><li>This greatly affects the weather. </li></ul><ul><li>It is important to us because we need to wear different clothes for different temperature. </li></ul>
  9. 9. How do we measure air temperature? <ul><li>Thermometers are used to measure air temperature. </li></ul><ul><li>They are placed in the shade, 1.5m off the ground. </li></ul><ul><li>That is because in direct sunshine and on the ground, temperature recorded maybe much higher than that off the ground. </li></ul><ul><li>Air temperature is measured in degrees Celsius (‘C) or degrees Fahrenheit (‘F) </li></ul>
  10. 10. Photos I <ul><li>Solar Panels </li></ul>
  11. 11. Photos II <ul><li>A Six’s thermometer </li></ul>
  12. 12. ~ End ~ TQ Team C0112425 2001 http://library.thinkquest.org/C0112425

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