In addition to rocks, there were many other special books in nature, such as: Crystal Book: Crystal is a transparent mineral that usually presents beautiful crystal shapes. It is a unique work of art of nature. 2. Coral Book: Coral is a kind of biological rock that is formed by the secretion of resin from coral. It is a very beautiful decorative and building material. 3. Pearl Book: Pearls are a kind of pearl secreted by shells. After a long period of geological changes and seawater erosion, they form various forms of pearls. Meteorite Book: Meteorite is a rock formed by the impact of a celestial body outside the Earth. It contains minerals and chemical components that are not found on Earth. It is an important research object in astronomy and astronomy. Volcano Book: The lava and rocks formed during volcanic eruptions form a unique geological phenomenon and landscape. It is also an important geological heritage on Earth. Sedimentation book: Sedimentary rocks are formed by the precipitations of substances in the atmosphere and ocean, forming various forms of landforms and landscapes such as Huangshan and Huashan. Glaciers are an ecosystem made up of ice sheets and glacial lakes that contain the freshest and purest water resources on Earth. Nature is filled with all kinds of books, and it's a special place worth studying and exploring.