Provide developmental edit suggestions for the following: The body of the wall was a long, thin ellipse that angled down toward the ground along its full length, curving toward its base at the midpoint. It was an extrusion of dust and rocks and sand that covered all of Mars below it, starting in the north and stretching south through Tharsis Montes and NAME_1 to Syrtis Major Planum in the northwest. NAME_2 could not see its base from his vantage point, but he knew it lay far below him. The wall had taken centuries to build.
Air whipped through the crystal towers and halls of the wall, a thousand times richer in breathable oxygen than the thin nitrogen atmosphere outside.  It was a small, self-contained bubble of life, a miniature of the natural habitat that once covered the planet alfresco.
The air outside was red, thinner, and poisonous, its atoms stripped of the life-giving elements that made up the atmosphere of the habitable zone.
