A glowing, translucent blue sphere representing the massive volume of mantle-bound water, cleanly mirrored next to a stylized sphere representing Earth's surface oceans. Side-by-side equal volume scale comparison floating in clean negative space. Composition: wide editorial, frontal, featuring Balanced diptych composition floating cleanly inside the canvas with a safe 4-sided margin. Scientific details: Equal spherical volume visualization comparing surface hydrosphere volume to mantle-bound water equivalents; no numerical labels or text. Color palette: Deep ocean blue, crystal cyan, charcoal, crisp white. The complete visual composition must sit comfortably inside the canvas with generous clean white/off-white negative space visible on the left, right, top, and bottom. Keep all important objects fully inside the safe frame. Nothing important may touch or cross any edge of the image. Do not crop the primary subject. Do not use edge-to-edge artwork. Do not fill the entire frame with background scenery. 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
