Explain the following physical features and give an example of each :
a. Doab
b. Lagoon
a. Doab - The land that lies between two rivers is called doab. Eg. Agra
b. Lagoons - lagoons are salt water lakes separated from the main sea by sand bars and spits. Eg. Chilka Lake
Distinguish between the natural growth of population and migratory growth of population.
Name any two products which are transported through a pipeline. Mention two advantages of this method of transport.