When we think of sources of water, we normally think of rivers and oceans. But, do you know that 80% of the world's population depends on water that is below the Earth's surface? This water is called Groundwater.

In fact, 25% of the groundwater that is extracted in the world is extracted in India! And, as our population grows, we are losing more and more groundwater. We will learn about this, and other such depressing facts, in this module!