Karst topography is a result of the dissolution of soluble rocks like limestone, dolomite and gypsum.Cenote is a natural pit or a sinkhole which results from the collapse of a limestone bedrock exposing the groundwater underneath. Cenotes are commonly found in low-lying areas like islands, coastlines, etc.
Around 1750, at the dawn of the Industrial Revolution, the world population was 550 million. World population exploded in the eighteenth century after the Industrial Revolution. Human population increased more than ten times in the past 500 hundred years. In the twentieth century itself the population has increased four times. Nearly 80 million people are added each year.
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