We can't drink sea water because it contains salt.


In KS2 geography children will look at the water cycle - evaporation, condensation, precipitation, rivers and seas. Also covered in this topic is the treatment of sewage, drought and flooding.

The liquid that forms seas and lakes is water. Water is lifted from the surface of the Earth by evaporation. It then cools and through condensation forms clouds. These clouds when cooled further release their water as rain, sleet, hail or snow. It then falls back down to Earth and finds its way back to the sea through rivers. This process is called the water cycle. Water is essential to life and without it all animals and plants would die. Seas are made up of saltwater, whereas rivers are mostly freshwater. Water can be solid (ice), liquid (the sea) and gaseous (steam from a boiling kettle). Pure water is tasteless and odourless.

This quiz tests what you know about the water cycle - from evaporation, through condensation and rainfall and then back to the seas and oceans.

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  1. What is the process called when water turns into a gas and rises into the sky?
    Sunshine and wind can both cause evaporation. That's how wet clothes dry on a washing line - the sun and wind evaporate the water in them
  2. Why can we NOT drink sea water?
    Salty water can make us very sick
  3. What is the process called when the gas cools and forms clouds?
    When water vapour cools it forms droplets. The mist formed if you breathe on a mirror or window is condensation
  4. Which is NOT an essential use for water?
    Paddling pools are for fun rather than a necessity
  5. Why should water be treated before we drink it?
    Many people around the world die from water borne diseases
  6. Which water issue is NOT a problem that causes death for people around the world?
    A hoepipe ban is a method we use to preserve water when there is a shortage
  7. What happens to the waste water from our homes?
    The sewage works removes things like paper, fat, soap and human waste from the water
  8. Where is nine tenths of the Earth’s water?
    There are five oceans in the world
  9. What is the cycle that ensures we do not run out of water?
    Water rises as vapour from the sea and the ground and forms as clouds. It then falls again as rain
  10. What is caused by too much rain falling at once?
    Floods can cause rivers to burst their banks and cause devastation

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