Accurate measurements have been collected for more than a century.
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In the past century, the world has recorded a rapid increase and decrease in population in different geographical areas. This has been influenced by different factors such as urbanization and family planning.
Urbanization creates better employment opportunities and wages. It also provides better social amenities such as schools and hospitals. These encourage people to move from rural areas to urban areas in search of a better living. The migration results in a decrease of population is the rural areas and a rapid increase in population in the urban cities.
Increased access to contraceptives has enabled women to limit family sizes. Women are able to plan for the number of children they intend to have. This has generally decreased the population growth in developed regions.
The number of volcanoes is higher in the Pacific ocean compared to the Atlantic Ocean. This is due to the fact that the Ring of Fire, a ring of volcanoes that are most active, is situated in the Pacific Rim. Most of the volcanoes on Earth<span> are situated around the </span>Pacific Ring of Fire because that is the location of most<span> of the Earth's subduction zones.</span>