Unit 9
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Unit 9






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Unit 9 Unit 9 Presentation Transcript

  • Hydrosphere and atmosphere Larisa Grebenisan Curso 2010/2011 C.E.I.P Maestro Juan de Ávila
  • The hydrosphere
    • The hydrosphere is a layer formed of all the water on Earth, except the water vapour in the atmosphere.This layer covers three quarters of the surface area of the planet.
  • The waters of the hydrosphere
    • The hydrosphere includes:
    • Oceanic waters: the waters that form the oceans and seas.
    • Continental waters: the waters that cover part of the continents (rivers, lakes, masses of ice) and underground water.
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  • The hydrosphere is always moving
    • The waters in rivers flows until it reaches the seas and oceans.
    • The water in seas and oceans moves because of three phenomena:
    • Waves are undulations of the water on the surface, caused by the wind.
    • Currents are masses of water that move from one place to another, like a river within the sea or ocean.
    • Tides are movements up and down of the leven of the water, every six hours.
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  • The importance of the hydrosphere
    • The hydrosphere provides the water that all living things need to survive.
    • We use the water of the hydrosphere to drink, clean, cook and in industry and farming.
    • In the hydrosphere we realice activities like swimming and fishing.
    • The hysdrosphere provides the water that all living things need to survive.It is also an habitat and we use the water for many things.
  • The atmosphere
    • The atmosphere is the layer of air that surrounds the geosphere and the hydrosphere .It extends about 1000 kilometres above the Earth’s surface.
  • The layers of the atmosphere
    • The atmosphere has different layers:
    • Troposphere.The first 12 kilometres above the surface of the Earth.
    • Stratosphere.Between 10 and 50 kilometres above the surface of the Earth.
    • Higher layers.Above the stratosphere are other very cold layers with few gasses. They are: The mesosphere, the thermosphere and the exosphere.
  • Changes in the atmosphere
    • The atmosphere changes continually : wind, precipitation, clouds …
    • All the changes in the atmosphere are called atmospheric phenomena.
  • The importance of the atmosphere
    • The atmosphere is very important for life on Earth:
    • It filters dangerous solar radiation, particularly the ozone layer.
    • It maintains the heat of the planet.
    • It contains gasses necessary for photosynthesis and breathing.