What is the global distribution of megacities

global distribution of megacities refers to the dispersion of a population of 10 million people or more in all parts of the world.

Explanation:

Global distribution  of megacities is usually determined by the number of people within a population which should not go below 10 million. these people making up the populations can be located in different locations, either in the cities or in the countryside. In January 2015, for example, China’s Pearl River Delta conurbation overtook Tokyo as the world’s largest city (Van Mead, 2016). However, this depends on how the ‘city’ is measured – the Pearl River Delta includes the cities of Shenzhen, Guangzhou, Foshan and Dongguan (but not Hong Kong, which is considered a separate territory under its ‘Special Administrative Zone’ status within China). If these cities were measured separately, Tokyo would likely remain the world’s largest city.

heat released by collision processes during accretion, and heat from decay of radioactive elements

explanation: