hand-drawn 2D explainer cartoon illustration, thick clean black outlines, simplified readable forms, flat cel-style colors, soft minimal shading, expressive human characters, clean educational YouTube illustration, simple depth, clear focal hierarchy, no photorealism, no 3D rendering. Centered side-profile geological cutaway diagram on clean white canvas, occupying central 60% of frame. Submerged translucent white selenite crystal pillars growing in mineral-rich subterranean groundwater pool heated by a deep glowing orange magma chamber below. Clear geological strata layers, wide white margins, flat cel colors, clean black outlines, no photorealism, no 3D, no text.
