科普图表：岩石轮回之环

Scientific infographic poster of the rock cycle, front-view flat presentation. Layout: a large circular cycle diagram at the center with three major rock-type nodes: igneous (granite, basalt) shown with a volcano icon, sedimentary (sandstone, limestone) with layered cliff icon, and metamorphic (marble, slate) with a pressure anvil icon, connected by three curved arrows labeled melting and cooling, weathering and erosion, and heat and pressure, each arrow with a small process icon of a lava flow, falling rain and a glowing crystal. Small inset panels show six example rocks with flat texture swatches. Color system: igneous heat reds and deep grays (#D84315, #455A64), sedimentary warm browns (#A1887F), metamorphic purple-grays (#7E57C2), on a pale limestone background (#F5F0E8) with arrow gradients between nodes. Typography: bold geoscience sans-serif, clear process labels, small specimen captions. Background: subtle stratified-rock banding texture. Data feel: geology textbook diagram with curved directional arrows and node depth shading. Lighting: even diagrammatic light with soft node glows, crisp edges. 4k