Where do shield cones form?

S. H. I. E. L. D. is a fictional espionage, law-enforcement, and counter-terrorism agency appearing in American comic books published by Marvel Comics. Created by Stan Lee, it often deals with paranormal and superhuman threats.

Shield volcanoes are formed by lava flows of low viscosity - lava that flows easily. Consequently, a volcanic mountain having a broad profile is built up over time by flow after flow of relatively fluid basaltic lava issuing from vents or fissures on the surface of the volcano.