Question

why is a river rich?​

Answer 1

Answer: There are two reasons 'why the river is called rich?' and here they are as follows,  

1)The river is rich because it has two banks.

2) Well, keeping the above reason aside we can even call a river rich as it has water and it is one of the most important resources needed for the survival of human beings.

Explanation: THNX

Answer 2

River is rich because it contains most important resource water.

Water is most important to live on the Earth surface...