Stone polygons is the peri glacial landform feature results from the sorting of surface stones and soil particles into stripes or polygons.
The coordinates that make up a polygon region are determined by actual latitude and longitude values. A point (position) is the fundamental building block of a polygon, and you need at least three points to enclose a region in a polygon.
A peri glacial landform is a structure that is the product of strong frost, frequently in conjunction with perma frost. Periglacial landforms can only be found in regions with cold, essentially nonglacial conditions.
In the arctic and subarctic regions, rivers draining perma frost-covered basins release water and debr is into the sea, forming peri glacial-deltaic landscapes.
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Answer:
Trans-Sahara trade is one of the oldest trading networks in Africa.
Explanation:
The trading network requires to travel across the Sahara between sub-Saharan Africa and North Africa. Existing since prehistoric times, it reached its peak in the 8th century. In West Africa, the changes came in Ghana when the Almoravids sacked the city and the Ghāna Empire decline.
Mali rise in the 13th century as gold became the core of the trans-Saharan trade. The Trans-Sahara trade saw the rise of empires like Mali, Songhay, and Bono-Mansu. Expansion of urban centres and towns happened as Kano became one of the urban centres in West Africa. Trade also saw the rise of trading classes call the Wangara.
An exchange rate is how much of your country's currency buys another foreign currency. For some countries, exchange rates constantly change, while others use a fixed exchange rate. The economic and social outlook of a country will influence its currency exchange rate compared to other countries. Hope this helps
