Unit 5


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Unit 5

  1. 1. The air is a mixture of gases.It contains Nitrogen, Oxygen and other Gases.
  2. 2. The atmosphere is a blanket of air which covers and protects the Earth from radiation and cold space. The atmosphere has 5 layers: Troposphere, Stratosphere, Mesosphere, Thermosphere and Exosphere.
  3. 3. It is the upper layer of the atmosphere.It is where astronauts orbit the Earth. It is the coldest layer of the atmosphere It is where aeroplanes fly. It is where the weather occurs.
  4. 4. It is the degree of It is moving air. heat or cold. It is caused by differences in air pressure.
  5. 5. It is the amount of It is a type of water vapour in the airwater precipitation
  6. 6. It contains thunder and It is a heavy fall lightning. of snow.A lightning is a flash of electricity.
  7. 7. They occur after They occur when thereheavy rain, when snow is very little rain for a melts or river rises. long time.
  8. 8. We use a thermometerto measure temperature. We use a rain gauge toThe mercury expands or measure rainfall. contracts when it’s hot It is an open-ended tube or cold. that collects rain.
  9. 9. We use the anemometer We use a rain gaugeto measure wind speed to measure water and direction. vapour in the air.