<span>Ptolemy might rather be remembered for his contributions to geography than to astronomy. His maps of the world were so accurate for the time that they were used by scholars all over the world for centuries. Christopher Columbus based his theory of finding a westward route to India on Ptolemy's maps. Ptolemy's book Guide to Geography is often considered the beginning of the modern science of cartography, or mapmaking. The strength of the Guide to Geography is that in it, Ptolemy used the important system of latitude and longitude, the lines on a map that pinpoint certain locations, for the first time. The basic idea of latitude and longitude had been suggested by the Greek astronomer and geographer Eratosthenes 400 years before, but it was Ptolemy who developed a system detailed enough to be practical.The book lists the latitude and longitude of about 8,000 geographical locations known to the ancient world. Considering the simple tools and conflicting information Ptolemy had to work with, his maps are remarkably accurate.</span>
Hi, your answer will be the third option.
Hello i can help you with this no problem<span />
Answer: 3,2,4,1
Explanation:
The Muslims first conquered Egypt in 641 CE and over the next 4 decades continued to conquer North Africa until they had overrun all of North Africa.
It was after these conquests that they started hearing about civilizations South of the Sahara through the conquered people and began to visit and trade with them.
This trade flourished and brought great riches to the nations that were involved. The man arguably considered the richest in history, Mansa Musa, was King of the Mali kingdom that benefitted richly from such trade.
Along with that trade came Islamic teachings and through this medium many were converted. Mansa Musa himself was a Muslim who's riches became well known when he performed the Hajj to Mecca.
Islam then slowly spread to the south of Africa after the trade gave them a foothold in the West.
So, the correct order is,
Arabs come into North Africa, then All of North Africa comes under Muslim
rule, then The gold-salt trade flourishes on the trans-Saharan route and finally Islam spreads to western and southern of Africa.
