Water pollution is the contamination of bodies of water such as lakes, rivers, oceans, and groundwater. It is one of the most serious types of pollution.
Water pollution can have many different causes. Factories dump industrial waste into lakes and rivers. Sewage from households is another cause. Farms using pesticides to kill insects and herbicides to kill weeds can lead to water pollution.
‘non-point source’ pollution.
Water pollution can have dramatic effects. In many poor nations, there are frequent outbreaks of cholera and other diseases because of people’s drinking untreated water. Humans can even die if they drink contaminated water. Polluted water also causes the death
II
1 If he were tall, he could play volleyball well
2 Unless we waste paper, we will save thousand of trees
3 She said to me that they were doing an experiment
4 Nick asked his friend if he went to school by bus
5 Mai asked Tim where he could find English book
