During an educational trip, a student of botany saw a beautiful lake in a village. She collected many plants from that area. She notices that villagers were washings clothes around the lake and at some places waste material from houses was destroying its beauty.
After few years, shw visited the same lake again. She was suprised to find that the lake was covered with algae, stinking smell was coming out and its water had become unusable. Can you explain the reason for this condition of the lake ?

Explanation

The inflow of domestic waste from houses and fertilizer of plants and the entry of soaps and detergents result into accumulation of phosphate in water. As a result, formation of algae increases which covers the water surface and concentration of dissolved oxygen decreases. Hence a process called eutrophication occurs.