miércoles, 23 de enero de 2013

AIR AND WATER - REVIEW



And remember:

  • Air is a mixture of different gases. One of these gases is oxygen.
  • People, animals and plants need oxygen to live.
  • There is water in the sea, in rivers, in lakes and in clouds.
  • Sea water is salty. You cannot drink it. You cannot water plants with it.
  • There is fresh water in rivers and lakes. You can drink it. You can water plants with it.
  • Water is a liquid. Water vapour is a gas. Ice is a solid.

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