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I don't understand this question

 

Ans 1. Sanitary landfills are sites where waste is isolated from the environment until it is safe. However, sanitary landfills should not be constructed near water bodies. That is because they can pollute the surrounding groundwater and soil by releasing toxins and leachate.

 

Ans 4. There are two types of wastes, biodegradable and non-biodegradable, which need different methods of disposal. Thus, waste needs to be segregated into these two types so that it can be disposed off suitably.

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