illustration, minimalist

illustration, minimalist cartoon style, color palette of brown, green, and yellow, natural soil and vegetation, green vegetation at the top with roots extending downward, middle layer of varied brown soil with stones and particles, deeper layer of darker soil with more stones, natural distribution of stones and particles in each soil layer, natural and ecological atmosphere, underground soil texture, underground water, simple background design, clear depiction of soil structure, conveying natural ecological information, clean and straightforward visual effect, size 25:6