Answer:

Our main sources of water for drinking, washing, agriculture and industry are surface water, groundwater and collected rainwater, all of which are dependent on rain and snow falling on the Earth's surface.

Answer:

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Private health care services are expensive. Better service is available at a higher cost. They are well equipped with modern machines and technologies. People with good earnings will be able to afford them. 

Public health care services are comparatively cheaper. They are available at a cheaper cost for everyone. That is the reason they are over-crowded and the services provided might take time to reach the people. At times they lack proper equipments too which leads to delay in service provided.