Clean educational science infographic, horizontal 4:3, four panels arranged left to right with no crossing lines or arrows. Panel 1: wisps of vapor curling over a cloud above a snowy field with small pine trees, label 'Vapor rises'. Panel 2: a tiny ice nucleus forming as small ice crystals gather around a dust speck inside a cloud, label 'Ice nucleus'. Panel 3: a small hexagonal crystal growing six branches, label 'Branches grow'. Panel 4: a large detailed six-fold snowflake falling over a snow-covered pine branch, label 'Snowflake falls'. Soft icy blue background, warm amber accents, simple flat illustration style, each label short and printed cleanly below its own panel, no paragraphs, no other text, no logos, no watermark.