1. Fresh water comes from ice sheets, ice caps, glaciers, icebergs, lakes, rivers and streams. They also come from underground sources like; groundwater in aquifers and underground watercourses. The water in glaciers and ice caps is frozen. Only 3% of the planet's water is fresh. Water all has something to do in the water cycle. First there is evaporation; water becomes water vapor and turns into gas. Condensation then occurs and the water vapor turns into a cloud. The last one is precipitation, it is rain, snow, etc. (to be continued)2.3. 70% of fresh water is made up of ice contained 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. Fresh water is used for washing, feeding and drinking. We cannot drink salt water because we will die. (To be 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. (To be continued)6.7.8.9.10. Acid can also appear in snow, fog and other forms of precipitation. When humans burn skeletal materials, so-called sulfur dioxide and nitrogen dioxide are released into the air and spread throughout the world. These gases are absorbed by water and air or oxygen. When acid rain falls as precipitation, it runs off the surface and eventually ends up in the ground. Acid rain has many effects on nature, although it mainly affects lakes, rivers and all other aquatic areas. Aluminum is absorbed by acid rain, this material comes from the soil and is found in lakes and rivers. Therefore, it is toxic to all animals that live in water. Questions from the Water module. How important is a clean paper, in the middle of the paper......and the quality is affected. Q. What is the effect of water pollution on humans?A. If they eat seafood from polluted water they can get diseases like hepatitis and in poor countries they drink polluted water and then they can get cholera.Q. Explain how science and technology can help combat water pollution problems.A. They helped invent machines that, e.g. flush the polluted water so it can be reused.Q. . How does the density of water change during 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 use a type of water vapor fuel, which does not affect ongoing global warming, which is a good thing..