The correct answer is: Balkanisation: Balkanisation refers to the process of fragmentation into smaller pieces, such as the fragmentation of a country or a nation into smaller pieces.
The term has its origin in the conflict in former Yugoslavia, when the country Yugoslavia) was fragmented into Bosnia, Serbia, and other
Convection is a process which transfers the heat between the temperatures when fluid (i.e. liquid or gas) is in motion. Due to the presence of heat source, water temperature increases and also it will become less dense and rise. Hot air is less dense than cold. When air rises higher in the atmosphere its pressure gets down and it becomes colder.
Hydrogen is used by plants which combine it with carbon during the photosynthesis process and release oxygen into the atmosphere which is used by all living beings.