#BOD and COD

(A) What is 'Acid Rain'. Describe its causes and how it can be prevented? (B) What is 'Water Pollution'. Discuss its causes and measurement methods. Name the countries with the highest and lowest percentage of it. (C) Write a comprehensive note on 'Smog'. (D) Describe different causes of 'Tsunami'. Is there any difference between a Tsunami and a tidal wave? Name the worst Tsunami ever recorded.

#cssnexus #Acid Rain #Prevention of Acid Rain #Water Pollution