How much amount of dissolved oxygen does gravely polluted water consists of?

When domestic sewage mixes with river water, __________<br> </h2></div>

The substance that pollute the water are called _________.</h2></div>

Freon gas causing stratospheric <span class="katex"><span class="katex-html" aria-hidden=&q…

By the end of the twentieth century what percent of the land of India was covered by forests?

Radioactive Sr-<span class="katex"><span class="katex-html" aria-hidden="true"&gt…

What is the main factor of sharply dropping the amount of ozone in the atmosphere?<br> </h2></div>

<span>Deforestation causes__________ to linger in the atmosphere.</span></h2></div>