The West African city that became an economic center of trade due to regional commerce is Timbuktu.'
<h3>How did
Timbuktu become a regional center of commerce in West Africa?</h3>
Timbuktu's strategic location at the confluence of desert and water made it an ideal trading center. It was absorbed by the Mali empire in the late 13th or early 14th century. By the 14th century, it was a thriving trans-Saharan gold and salt commerce center, as well as a center of Islamic culture.
The city's proximity to the Niger River encouraged trade between West Africa and Morocco in North Africa. By the early 1300s, Timbuktu had become the nexus of a variety of east-west and north-south commerce routes, and it quickly became the Mali Empire's primary commercial metropolis (albeit not it's capital).
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siliceous
Deep seafloor deposition in the form of ooze is the largest long-term sink of the oceanic silica cycle (6.3 ± 3.6 Tmol Si year−1). As noted above, this ooze is diagenetically transformed into lithospheric marine chert.
calcareous
Calcareous ooze is a calcium carbonate mud formed from the hard parts (tests) of the bodies of free-floating organisms. Once this mud has been deposited, it can be converted into stone by processes of compaction, cementation, and recrystallization. ... Foraminifera are also single-celled organisms.
