How Cities Treat Our Water1.Water is drawn in from lakes, riversor ground water.Incoming water is screened () toremove() all large objects.2.Inside the plant, Chlorine() is added to killCImicro-organisms(微生物).After that, Aluminum () is3.added to bring remainingparticles() together.4...
D 11. Mona can get water from the A. rivers R trees C. flowers D. leaves12. How old is Gerry? A. Five. B. Seven C. Eight. D. Eleven.13. Which of these animals can't see things very well? A. The koala. B. The elephant. 相关知识点: 试题来源: 解析 答案见上 反馈 收...
But some people don’t really care about this . They waste a lot of water pour dirty water and throw rubbish into rivers or lakes. As a result many rivers and lakes are polluted and there is less and less water for us to drink. So we must do something to protect the water resource....
Some countries don't have enough clean water for their rapidly growing populations, and they can't afford the infrastructure necessary to clean and transport it. For example, most people in China's cities suffer from water shortages, and most of China's groundwater, lakes and rivers are pollu...
(a)The water in rivers often contains pollutants such as acids.Describe how universal indicator paper can be used to determine the pH value of the water.dip indicator paper in to water compare the colour withcolour chart match colour with colour chart[2] ...
generally combining total precipitation, how many days the rainfall occurs, temperature, humidity, and sometimes additional factors. In some places, deserts have clear boundaries marked by rivers, mountains or other landforms, while in other places, there are no clear-cut borders between desert and ...
When liquid water evaporates, it becomes water vapor and enters the atmosphere. This process is essential to kickstart the water cycle, a continuous movement of water on, above and below the surface of the Earth. Evaporation occurs when heat from the sun causes water from oceans, rivers, ...
First, the agnostids may have been free-swimming predators that hunted smaller animals. It is known that other types of primitive arthropods were strong swimmers and active predators, so it is reasonable that the agnostids may have lived that way as well. And while the agnostids were small, so...
As we know, water is very important to man, we can’t live without water. The amount of water which is suitable to drink is less and less. But some people don’t care about it. They waste a lot of water in their daily life. Even worse, they pour dirty water into rivers. They ...
Water is continuously moving and changing its form as it goes through the step of this cycle: evaporation(蒸发), condensation(凝结), precipitation(降水)and collection. In the natural environment, here is how the water cycle works. The sun warms up the water in lakes, ri...