The document discusses bones and cartilage, the two materials that make up the human skeleton. It explains that cartilage is a strong, white material that bends, while bones are made hard by minerals. The document also names some parts of the body where cartilage is found, including the end of the nose, top of the ear, and where two or more bones meet. It then quizzes the reader on identifying bones, cartilage, or places with both in different body parts.