What happens when water is deoxygenated due to algal growth?

Macroscopic water pollutants include:</h2></div>

The ozone layer  'ozonosphere' occurs in</h2></div>

How much percent of impurities are enough to make domestic sewage unfit for humans?

Water pollution can be identified by testing its</h2></div>

What do BOD and COD stand for?

The reason for global warming is </h2></div>

Name the agents responsible for transportation of soil.</h2></div>