5th - Block 5 - the sun a source of heat and light

5th - Block 5 - the sun a source of heat and light

• 1.
  Block 5 –Lesson 2
• 2.
  Do you thinkthe Sun is a natural source of heat and light?
• 3.
  Most of theEarth’s energy comes from the Sun. It is important because it provides light and heat. Without the Sun’s heat and light, there would be no life on Earth, and the oceans would freeze.
• 5.
  Our planet withoutthe Sun
• 7.
  Most radiations fromthe Sun is absorbed by the atmosphere. The types of radiation that reach the Earth’s surface are visible light (white), ultraviolet light, and infrared light.
• 9.
  Solar light isenergy. It heats the Earth and it is the force behind climate and atmospheric weather. When the Earth receives light from space, part of it is absorbed and the rest bounces back to the atmosphere through reflection.
• 10.
  Reflection is thebouncing of the light when it hits a body, like the Earth and clouds. The Sun’s light also experiences a change of direction when passing from one material to another, for example from air to water, or from hot to cold air.
• 11.
  In this case,the rays of the Sun are refracted. A rainbow is formed in this way.
• 13.
  Heat is anotherform of energy. It can pass from one body to another. Temperature is measured with a thermometer.
• 15.
  When the Earth’ssurface is heated, it receives the heat radiation. In ecosystems, one part of this energy is used to evaporate water and the rest returns to the atmosphere.
• 17.
  Climate factors are:temperature, wind, humidity, precipitation and pressure. The relationship between these five factors and the Sun’s radiations, altitude and latitude determines the types of climate.
• 18.
  The types ofclimate determine the characteristics of the fauna and flora in ecosystems.
• 19.
  … is howyou see yourself!