1. Fresh water comes from ice sheets, ice caps, glaciers, icebergs, lakes, rivers and streams. They also come from underground sources such as; groundwater in aquifers and underground streams. The water in glaciers and polar ice caps is frozen. Only 3% of the planet's water is fresh. All water has something to do with the water cycle. First there is evaporation; the water becomes water vapor and turns into a gas. Then there is condensation and the water vapor becomes a cloud. The last one is precipitation, this is rain, snow, etc. (continued)2.3. 70% of fresh water is ice in polar ice caps or glaciers. Sometimes there is snow. The rest of the fresh water is used by humans. So in comparison there isn't much left. Fresh water is used for washing, eating and drinking. We cannot drink salt water because otherwise we will die. (Continued)4.5. The average amount of salt in a liter of salt water is 35 grams. If the freezing point of salt water decreases, the amount of salt ink increases. (Continued)6.7.8.9.10. Acid can also appear in snow, fog, and other forms of precipitation. When humans burn skeletal materials, something called sulfur dioxide and nitrogen dioxide enters the air and spreads around the world. These gases are absorbed by water, air or oxygen. When acid rain comes down through precipitation, it runs over the surface and eventually settles into the soil. Acid rain has many effects on nature, although it has greater effects on lakes, rivers and all other aquatic areas. Aluminum is absorbed by acid rain, this material reaches lakes and rivers from the ground. Therefore it is toxic to all animals that live in water. Questions about the Water module. What is the importance of cleanliness, f...... half of the paper ......r the quality suffers. Q. What is the effect of water pollution on people?A. If they eat seafood from polluted water they can contract diseases such as hepatitis and in poor countries if they drink polluted water they can contract cholera. Explain how science and technology can help combat water pollution problems.A. They helped invent machines that e.g. rinse the polluted water so that it can be reused.Q. . How does the density of water change in different phases?A. When water evaporates the mass of the water changes a lot but the density remains the same.Q. . Explain how science and technology can help reduce pollution when hydrogen cars are used (benefits).A. Hydrogen cars are powered by some sort of water vapor, so they don't affect ongoing global warming, which is good.