Water, a precious physical substance, is essential to all living organisms.

i) Which is the largest water resource?

ii) What are the various sources of water?

iii) Which is the primary source of water?

iv) What are the ways by which you can raise the ground water level in your house?

i) Oceans are the largest resource of water on earth. They contain almost 97% of the total water present on earth. The water from oceans is unfit for drinking.

ii) The various sources of water are as follow:

● Oceans (unfit for drinking and other uses)

● Glaciers and poles (fresh water is in ice form)

● Ponds

● Rivers

● Lakes

● Groundwater

iii) Rainfall is the primary source of water on earth. Groundwater, ponds, rivers, lakes all get filled with rain water. Thus we can say that rainfall is the primary source of water on earth.

iv) Ground water is the water that is available beneath the land surface in aquifers. Aquifers are the rocks that store ground water. Water sips through the soil and gets stored beneath the land surface. In this way, ground water level rises.

We can raise the groundwater level in our houses by following ways:

● By rain water harvesting:

We should not let the rain water to waste. Instead, we can collect the rain water from our roofs using pipes into underground tanks:

● By using kitchen water for gardening

● By reusing waste water