36. What is the name of the process by which salt is removed from seawater to make it drinkable?
a) Filtration
b) Disinfection
c) Desalination
d) Distillation
37. Which of the following is not a method of controlling water pollution?
a) Treatment of wastewater
b) Reduction of industrial discharge
c) Use of plastic bottles
d) Improvement of agricultural practices
38. What is the name of the process by which nutrients from agricultural runoff cause excessive growth of algae in bodies of water?
a) Eutrophication
b) Acidification
c) Salinization
d) Desalination
39. Which of the following is not a type of waterborne disease?
a) Cholera
b) Malaria
c) Typhoid fever
d) Hepatitis A
40. What is the name of the process by which water is naturally purified as it passes through layers of soil and rock?
a) Filtration
b) Disinfection
c) Distillation
d) Reverse osmosis
