Outbreaks of Water-borne diseases are common after heavy rainfall, especially in poor rural areas. Name any two water-borne diseases.

A group of children went to a park on a picnic. When they returned home, they left behind some empty tins and bottles, wasted crumbs of food, used paper plates and napkins. Which of these things would decompose and become part of the soil? What would happen to the rest? What should the children have done with these things?

Ramu collects sheets from old calendars that are blank on one side. Why does he do this? What do you think he will use these sheets for?

Trees growing near a factory often gather a lot of dust on their leaves.

When trees on the hillside are cut down, there is the danger of soil erosion on the hill.