Fresh Water Essay

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1. Fresh water comes from ice sheets, ice caps, glaciers, icebergs, lakes, rivers and stream. They also come from underground sources like; groundwater in aquifers and underground streams. The water in glaciers and ice caps is frozen. Only 3% of the water on the planet is fresh. The water all has something to do the water cycle. First you've got evaporation; water becomes water vapour and changes into a gas. Then there is condensation and the water vapour becomes a cloud. The last one is precipitation, this is rain, snow, etc. (to be continued)

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3. 70% of the fresh water is ice in ice caps or glaciers. Sometimes it's snow. The rest of the fresh water is used by humans. So in comparison there's not much left. Freshwater is used for washing, food and drinks. We can't drink salt water because than we will die. (To be continued)

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5. The average amount of salt in one litre salt water is 35 grams. If the freezing point if salt water decreases the amount of salt ink the water increases. (To be continued)

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10. Acid can also appear in snow, fog and other forms of precipitation. When humans burn skeleton materials something that is called sulfur dioxide and nitrogen dioxide come in to the air and spread around the world. These gasses are taken up by water and air or oxygen. When acid rain comes down by precipitation it flows across the surface and at the end occurs itself into the soil. Acid rain has a lot of effects on nature, though it has most effect on lakes, rives and all other aquatic areas. Aluminium is absorbed by acid rain, this material comes form the soil in to lakes and rivers. Therefore its toxic for all the animals that live in the water.

Water module questions.

What is the importance of clean, f...

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...r quality is affected.

Q. What is the affect of water pollution on people?

A. If they eat seafood that comes from the polluted water they can get diseases like hepatitis and in poor countries they drink from the polluted water and then they can get cholera.

Q. Explain how science and technology can help to fight against the problems of water pollution.

A. They helped to invent machines that for eg. rinse the polluted water so it can be used again.

Q. . How does the density of water change in the different phases?

A. When the water evaporates the mass of the water changes a lot but the density stays the same.

Q. . Explain how science and technology can help to reduce pollution when hydrogen cars are used (benefits).

A. Hydrogen cars have a sort of water vapor fuel they drive from so it doesn't affect the global warming that is going on which is good.

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