The planet may have or may not have had liquid water on it.
Agriculture availibilty is profound in these areas as fields for agriculture is great for farmers. Spices and vegetables can be grown very well.
Silicates
It is classified this way because of the SiO4 tetrahedra within them.
Hope this helps!
-Daisuke
The correct answer is: mineral deposits brought wealth and power
In the past, the African Kingdoms were really famous for their wealth. Their kingdoms were located near the source of mineral deposits which granted them a huge sources of ore such as metal and Gold. As their wealth increases, it's easier for them to obtain other things like armies and weapon which bring them more power