Explain the concept of water quality. Explain the influence of various natural processes to determine the water quality. Discuss the effects of the contaminated water on environment.

Water quality refers to the physical, chemical, and biological characteristics of water, which are important for its suitability for various uses such as drinking, agricultural irrigation, industrial purposes, and supporting aquatic life. The quality of water is typically measured by several parameters, including temperature, pH, dissolved oxygen, turbidity, and the presence of harmful substances like heavy metals, pathogens, and nutrients. Good water quality is essential for human health, ecosystem sustainability, and economic activities. Water quality is a dynamic attribute, influenced by both natural processes and human activities. It is primarily assessed in terms of the degree of contamination, which can range from pristine water to heavily polluted water.

### Influence of Natural Processes on Water Quality

Water quality is largely shaped by natural processes occurring within the water cycle. These processes include precipitation, evaporation, runoff, groundwater infiltration, and the natural buffering capacity of water bodies. 

1. Precipitation: Rainwater acts as a natural purifier by removing particulate matter and pollutants from the atmosphere. However, if the rainwater falls through polluted air, it can carry with it contaminants like sulfur dioxide, nitrogen oxides, and particulate matter, leading to acid rain. Acid rain can lower the pH of water bodies, affecting aquatic life and water quality.

2. Evaporation and Transpiration: The process of evaporation leads to the removal of water from the surface of water bodies. This can concentrate dissolved substances, such as salts and minerals, leading to higher salinity levels in water bodies. Transpiration by plants can also influence water quality by contributing organic compounds to the water through plant roots and by stabilizing water temperature through shading effects.

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