______________ wells use pumps run by electricity or diesel.

A structure made to hold back the water of a river is called a _________.

Electricity made using the force of water called _______________________.

Irrigation take river water to areas of water shortage.​

we need water for

• drinking

• washing

• cooking

• all of these

which of these are big dams built across major rivers in India?

• Bhakra Nangal Dam

• Nagarjunasagar

• Hirakud

• all of these

Irrigation canals mostly take water from which source?

• sea

• wells

• rain

• rivers

dams built on rivers are useful in

• preventing floods

• irrigation

• producing electricity

• all of these

why can sea water not be used for drinking or irrigation?

what do you mean by rainwater harvesting?