Answer: The two processes of filtering and sterilizing river water are a purification process done to ensure that it is safe for drinking.
Explanation: Filtering: River water contains various impurities such as sediments, debris, bacteria, and other contaminants. By filtering the water, these impurities are physically removed, resulting in cleaner water. This helps to improve the taste, odor, and appearance of the water. Filters can be made of materials like sand, charcoal, or even membranes that trap the impurities while allowing water to pass through.
Sterilizing: Even after filtering, there may still be microorganisms like bacteria, viruses, and parasites present in the water. Sterilization is the process of killing or inactivating these harmful microorganisms to make the water safe for consumption. One common method of sterilization is using chemicals like chlorine or ozone, which effectively kill the microorganisms. Another method is through ultraviolet (UV) light treatment, where the UV rays damage the genetic material of the microorganisms, rendering them unable to reproduce and causing their death.