It is hard to imagine that the Qinghai-Tibet Plateau was once buried deep in the seabed, and the Himalayas never stopped rising, with an average annual increase of 18.2 mm. Geologists have unearthed a large number of dinosaur fossils, terrestrial plant fossils, three-toed horse fossils and many ancient marine life fossils in layered rocks. Faced with these fossils, geologists' thoughts returned to distant geological times. 200 million years ago, the Qinghai-Tibet Plateau was once the sea of Wang Yang. Later, due to the strong crustal movement, the Paleozoic Pleistocene mountain system was formed, and the ocean disappeared, resulting in the ancient Qilian Mountain and the ancient Kunlun Mountain. After 654.38+0.5 billion years of Mesozoic, these mountains were leveled by long-term weathering. After the Cenozoic era, the crust became active again, and those ancient mountains rose sharply and became mountains again. The Himalayas was the sea of Wang Yang more than 40 million years ago. It used to be a descending area, and creatures of all ages were buried in sedimentary rocks. As the Indian Ocean plate moved northward and collided with the Eurasian plate, the ancient sea in this area was squeezed, the Himalayas gradually rose from the seabed, and the plateau rose greatly, becoming the "roof of the world". Shell fossils in the Himalayas are physical evidence of geological structural changes.