Khadins,Bundhis,Ahars and Kattas are ancient structures that are examples for

Compare the water harvesting system used in hilly/mountainous areas with those used in plains or plateau regions.

Find out the source of water in your region/locality. Is water from this source available to all people living in that area?

$(a)$ Mention any two advantages of constructing dams.
$(b)$ Name a dam which was a subject of much opposition from locals as well as $NGOs$.
$(c)$ Mention any three problems which may arise due to the construction of large dams.

Khadins,Bundhis,Ahars and Kattas are ancient structures that are examples for

List two main causes of the pollution of water of the river Ganga. State how pollution and contamination of river water prove harmful for the health of the people of neighbouring areas.