The scientific value of stone, what is the scientific essence of stone?

Stones can be used for ignition, beauty, food and jade. Stones can be used as stepping stones. Drinking medical stone water can regulate human metabolism, increase appetite, promote circulation, help eliminate harmful substances accumulated in human body due to environmental pollution and purify cells. Long-term drinking can prolong life. Stone can be used to build houses, handicrafts and building materials. The most important use of stone in modern life is concrete. Making cement, even making concrete with cement, sand, pebbles or gravel, is all stone. Many raw materials of modern industry are stones: iron ore, copper ore, aluminum ore and so on. Stones can be used to beat dogs, collect stones, wear stones, write titles, and make "stone pots and sausages" ... rocks can be divided into three types according to their causes, but because nature is a continuum, it is difficult to really divide them into three lithology according to our classification, so there will be some excessive rocks, such as tuff (formed by volcanic dust and rocks falling into the surface or water), which may be classified as sedimentary rocks or igneous rocks, but sedimentary. Rocks that have been formed before become debris after weathering, or rocks caused by biological remains, and then are eroded, deposited and petrified. This kind of rock is layered, and the first kind is deposited in the lower part, which is older; The higher the level, the newer the times, which is called the law of overlapping layers. When rocks are deposited, they often contain organisms, which can be preserved well for a long time and then become fossils; In igneous rocks, there are mostly no fossils. Igneous rock The temperature and pressure inside the earth are very high, and all components (minerals) are in a molten state, which is called magma. Igneous rocks, such as basalt and granite, are solidified after magma invades the interior of the crust or flows out of the surface. Igneous rock is the most primitive of all rocks. The primary igneous rock or sedimentary rock of metamorphic rock can change its primary rock structure or organization, or make some minerals disappear, thus becoming another kind of rock different from primary rock, called metamorphic rock, such as marble changed from limestone; Shale metamorphic slate; Quartzite changed from sandstone, etc. Typical metamorphic rocks exist in Precambrian or orogenic areas, and cleavage related to regional structure or mineral changes usually exists.