Monday, November 23, 2009

Social studies questiton

1. List the main reasons for water scarcity

  • Water Pollution
  • Population growth
  • Land degradation
  • Variations in climate like drought.

2. What is a drought? What type of hardships do you think that a drought could cause if you were living in a village in a poor city like Ethiopia?
  • Drought is a long period oftime when it does'nt rain at a place.
  • If I lived in somewhere in Ethiopia during the drought, I would get sick because there is no water that could reach me.


3. How does land degradation affect the supply of fresh water?
  • Land degradation is when the soil cannot hold anymore water, so it just becomes run-off and flows back down into the sea or lake and that is where the whole water cycle occurs again!
4.
a) What is El Nino?
  • EL nino is when a big gust of wind makes all teh miost air reverse direction.
b) Why does El Nino usually cause drought in Australia?
  • becuase it prevents tropical air masses reaching Australia for long periods of time.


5. Observe the map showing the global effects of El Nino in 1982-83

a) What effects dies El Nino have when it comes to availability of fresh water?

b) Name the countries and describe the problems that arose from decreased rainfall by El Nino?

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