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That's a negative ghost rider.
there are areas all around this parallel that seem to have RED soil near it.
Originally posted by Nygdan
The problem here si that we often have scans that reveal sub-surface structure, and they don't show any tunnel system.
There are also submarin canyons that run the length of the continental slope, submarine mountain ranges throughout the oceans, large rift valleys, etc, etc.
there are areas all around this parallel that seem to have RED soil near it.
Itsw windblown dust, dust that contains iron minerals that have oxidized and turned red.