Full-frame 16:9 planetary interior cutaway cross-section dominating the entire screen from edge to edge: at the very top edge a microscopic paper-thin line represents the entire surface crust and deepest mines, transitioning down through thousands of kilometers of swirling orange-red mantle convection plumes, glowing liquid iron outer core, and culminating in the radiant golden-white crystalline solid inner core at the center-bottom, radiant geothermal luminescence, hand-drawn 2D explainer cartoon illustration, thick clean black outlines, simplified readable forms, flat cel-style colors, soft minimal shading, clean educational YouTube illustration, clear focal hierarchy, no photorealism, no 3D rendering, no typography, no text, no watermarks
