Answer: Because the Central Asian traders had originally applied the name to the Karakoram Pass.
Explanation: hope this is it
True. The volcanic lowlands were the source of obsidian, jade, and hermatite that the Mayans used to develop a lively trade.
The fault is towards the bottom of the diagram, so thats means that is would b e fairly new because the fragments/ particles that settle on the top are old and worn down. The fragments at the top are eventually at the top because of wind erosion in the layers. IM SO SORRY if this does not help you this was really the only way i could explain. I HOPE THIS HELPS YOU OUT