Sources of Drinking Water

The correct answer is 'D' - River and lake. River and lake water is a common source of drinking water for many communities around the world. Let's explore why this is the case.

River Water:
- Rivers are a major source of freshwater. They are constantly replenished by rainfall and melting snow, making them a reliable source of water.
- River water is usually less saline compared to seawater or ocean water, making it suitable for drinking.
- Many cities and towns are built along rivers, as they provide a convenient source of water for the local population.
- River water is often treated and purified before it is supplied to households for drinking purposes.

Lake Water:
- Lakes are large bodies of water that are fed by rivers, rainwater, and underground sources.
- Lakes are a valuable source of freshwater, especially in regions where rivers may not be easily accessible.
- The water in lakes is generally stagnant or slow-moving, which allows sediments and pollutants to settle at the bottom.
- However, lake water can still contain contaminants such as bacteria, algae, and pollutants, requiring proper treatment before it can be considered safe for drinking.

Advantages of River and Lake Water:
- River and lake water is often readily available in large quantities, making it a convenient source for supplying water to communities.
- These water bodies are usually located closer to human settlements compared to other sources like springs or underground water reserves.
- River and lake water can be treated and purified through various processes such as filtration, disinfection, and chemical treatment to ensure its safety for drinking.
- These sources can be replenished through natural processes like rainfall and snowmelt, making them a sustainable and renewable source of drinking water.

Conclusion:
In conclusion, river and lake water is a common source of drinking water due to its availability, accessibility, and the potential for treatment to remove contaminants. These water bodies play a crucial role in meeting the water needs of communities worldwide.