Which of these causes water pollution?
Using less water and preventing it from getting polluted is called ______________ of water.
Which of these can cause acid rain?
Which of these processes can NOT remove germs from water?
Chloroflurocarbons damage the ______________ layer present in the atmosphere
Which of the following gases combines with the blood and prevents it from carrying oxygen to the body?
Which of the following is not a pollutant unless present in excess?
Which of these methods does not result in conservation of water?
Water is renewed continuously in nature through
SPM stands for