Rainwater originates through evaporation and condensation in the natural water cycle, which removes many dissolved impurities. It is therefore traditionally regarded as the purest natural source before atmospheric or surface contamination occurs. Rivers, springs, and wells contain more dissolved substances and minerals.
Which of the following is the source of purest water in nature?
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Question context
This question is part of ⚗️ Biochemical Engineering within the broader 🧬 Medical Science subject and appears in the SPSC – Sindh Public Service Commission preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.