Measuring in light-years also allows astronomers to determine how far back in time they are viewing , Because light takes time to travel to our eyes. Everything we view during the dark in night has already been happened.
Islam gained momentum during the 10th century in West Africa with the start of the Almoravid dynasty movement on the Senegal River and as rulers and kings embraced Islam. Islam then spread slowly in much of the continent through trade and preaching. During this period these Muslims from North and West Africa came to be known by Europeans at large as Moors and were depicted by Europeans as black, swarthy or tawny in skin color.
According to Arab oral tradition, Islam first came to Africa with Muslim refugees fleeing persecution in the Arab peninsula. This was followed by a military invasion, some seven years after the death of the prophet Mohammed in 639, under the command of the Muslim Arab General, Amr ibn al-Asi.
Pacific-Ring of Fire is the other name for the Circum-Pacific Belt. Among the options given withing the question, the correct option is option "C". It is actually the zone of earthquakes where 90% of the earthquakes of the world takes place. Numerous volcanic eruptions also occur in this region. This is a region where there is continuos shift of the tectonic plates and this results in either volcanic eruptions or earthquakes or both. Numerous volcanoes are also a part of this region. It is a horse-shoe shaped region. It has almost 452 volcanoes and they are either active or dormant.
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