China’s Reed Flute Cave is nearly 180 million years old. Located in Guangxi Province, the limestone cave features stunning rock formations, stone pillars and stalactites, which form naturally from calcite mixing with dripping water over a very long period of time (generally about a quarter of an inch to an inch per century). . . . #geology #rocks #science #china #stone #nature #cave #caves #naturephotography #sciencephotography 📷 @gettyimages /Richard T. Wright