The Islam emerged in the sixth century AD, and with it, the first Islamic states started to occur. The Islamic states started to occur because this religion managed to unite lot of tribes and create one powerful entity. The military strength was big, so it was used for expansion, and on the territories that were conquered, the people were converted to Islam, very often forcefully. This has resulted in rapid change of the political and religious map of the world, with a very large area becoming dominated by Islam. The Islamic states, once properly established, flourished and were very advanced, having big achievements in numerous scientific fields. Unfortunately, the fundamentalist fraction managed to prevail over time and stopped the progress, so gradually the Islamic states started to fall behind the other parts of the world when it came to development, and that can be seen even nowadays.
Weather front is the boundary between two masses of air with different densities, temperature and humidity.There are four types of weather fronts: cold front (cold air mass, thunderstorms and rain) , warm front (warm air mass,smaller density than the cold front), occluded front (low pressure ares), it is formed when cold front overtakes a warm front) and stationary front , the boundary between two air masses that are not strong to be either both cold or both warm (clouds, precipitation).
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Chemical compound, any substance composed of identical molecules consisting of atoms of two or more chemical elements
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I don't know because they want to
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