Answer:
it's the regolith....hope this helps you
C Horizon - Also called regolith: the layer beneath the B Horizon and above the R Horizon. It consists of slightly broken-up bedrock. Plant roots do not penetrate into this layer; very little organic material is found in this layer. R Horizon - The unweathered rock (bedrock) layer that is beneath all the other layers.
As noted above, some political conflicts do not offer opportunity for activist engagement, but many do. Indeed, some of the conflicts that have been most frequently studied using conventional models are ones in which youth activism was a vital component of the conflict (but it has gone unmeasured). The best example of this is research on Palestinians. Of literally dozens of studies conducted on Palestinians in the occupied territories that have assessed conflict exposure and its impact, very few have attended to the activism component of youth experience.
That would have to be the large continent of Africa! Hope this helps :)
