9. Fill in the summary

This lesson has been written by Sir. C.V. Raman. He has emphasized on the importance of the world's most common liquid. Man has been searching for an  of life for ages - but the true medicine is very near to our hands; it is the simple . He draws example of the  civilization to show how one side is the most fertile land on the earth while the other is a sea of  without a speck of green. Nile river is the life-giving waters that has created and sustained the whole country of .

 

 

Water adds beauty to the countryside, be it a small stream or the that are a common sight in South India. These tanks store the silt-laden water full of nutrients and minerals which are  to the crops. But they are often  and not properly maintained. Swiftly flowing water carries fairly large and  while the finer particles which are more in number are carried to great distances.

 

 

The flow of water plays a great beneficial role in the  process of converting rocks into soil. India, an agriculture-based country, depends on seasonal rainfall/snowfall, as it is the only source other than the . Conservation of rainwater becomes a huge responsibility when  is not checked. Soil erosion though may not be evident at first; it is painfully apparent at the later stages when deep  are formed, rendering agriculture impossible. It calls for urgent preventive action - terracing of land, construction of bunds,  and planting appropriate types of vegetation are some of the measures suggested by the author. These measures serve a double purpose of preventing soil erosion and keeping the water on and in the soil.

 

 

The author also brings in other benefits of water like using boats for a cheaper transport system and , which can uplift rural areas of India. Water is both the most common and . The investigation about the nature and properties of water will always be of the highest scientific interest!