VOLCANIC CONSTRUCTION-MINING self containment/extinction/sealing build-up, with encircling channeling, with top unobstructed multi directional exit, can rise as high as 55km to build lower temperature Venus mountain-sky cities, as 11 km Venus Mount Maxwell or as 21 km Mars Mount Olympus.
Can be applied on Earth to build mountains/islands as Mount Fuji or Hawaii Islands. High temperature drill can open straight top exit and/or side mining exit. Volcanoes can produce sulfur, aluminum, diamonds, gold, nickel, lead, zinc, copper, general build-up material etc.
Fuj Gcity (Fuji)
Ves Gcity (Vesuvius)
Eve Gcity (Everest)
Aero-Terra Green Cities