The main cause for abundant coliform bacteria in the river Ganga is

Ground water will not be depleted due to

Opposition to the construction of large dams is due to

Which of the following is a fast-growing tree?

What are the various factors which are damaging our forests?

We often observe domestic waste decomposing in the bylanes of our homes. List four ways to make the residents aware that the improper disposal of wastes is harmful to the environment and also for their own health.