Which international day focuses on protecting clean water? A. Earth Day / B. World Water Day / C. World Food Day / D. Ocean Day

Thermal pollution refers to the presence of heat-resistant bacteria in water. True / False

What is "sewage"? A. Clean rainwater / B. Wastewater from homes and factories / C. Water used for farming

Which of these is a natural source of water pollution? A. Oil spills from ships / B. Plastic bottles / C. Animal waste from farms

What is one sign that a river might be polluted? A. Strong smell, foam, or dead fish / B. Cold water and rocks / C. Many plants on the riverbank / D. A slightly different colour

What does the pH value of water tell us? A. The amount of salt in it / B. The oxygen level / C. The temperature / D. The acidity or alkalinity of the water

What method is used in wastewater treatment to remove solid particles from water? A. Filtration / B. Combustion / C. Distillation / D. Evaporation

Which type of pollutant is most commonly associated with algal blooms? A. Heavy metals / B. Plastic waste / C. Pathogens / D. Nitrates and phosphates

Which heavy metal is most commonly found in polluted water and can cause neurological damage? A. Iron / B. Lead / C. Sodium / D. Calcium

Microplastics can enter the food chain through contaminated water sources. True / False.

What can communities do to prevent water pollution?

Which of the following diseases is most commonly associated with contaminated water? A. Tuberculosis / B. Asthma / C. Cholera / D. Diabetes