A clean flat-style educational infographic explaining why Earth has four seasons, arranged as four equal panels in one row: Spring, Summer, Autumn and Winter. Each panel shows the same tilted Earth globe at 23.5 degrees on its orbit path around a warm glowing Sun placed at the center-left, with straight yellow sun-ray arrows striking the Northern Hemisphere at different angles. Short labels only: Spring, Summer, Autumn, Winter, Sunlight, 23.5 degree tilt. Each panel uses one seasonal accent color: fresh green for spring, golden yellow for summer, warm orange for autumn, cool blue for winter, on a soft cream background with generous white space. Simple icons mark each season: sprout, sun, falling leaf, snowflake. Flat vector style, crisp outlines, friendly classroom poster, no paragraphs, no long text.