The Malthusian population growth theory is a concept that was proposed by Thomas Malthus, an English economist and demographer, in the late 18th century.
The hydrological cycle of the earth is the total of all processes in which water moves from the land and ocean surface to the atmosphere and back in form of precipitation.
India is a diverse country with varying topography, climate, and natural resources. This has led to the development of regional identities, such as the people of the Northeast or the people of the Himalayan regions.