Wet sand looks darker than dry sand, and the water its has ad no col to i. Around ea dry gr there i air, a light mee the boun between air and quartz is turned back sharply, so a great deal of it leaves the surface again after one or two encounters. Water between the grains softens that boundary. The light goes further into the sand before it escapes, more of it is absorbed on the way, and less returns to the eye.

Type only the missing letters. Each box is one letter, and the number of boxes matches the letters that are missing.