In the Wudalianchi World Geopark in Heilongjiang, I saw the old Black Mountain crater, and saw the black rocks left over by the volcanic eruption. Those rocks also retain the last form of the lava solidification process after the volcanic eruption. Even the beautiful Wudalianchi, The mountains and rivers around the lake are also relics of volcanic eruptions, and are masterpieces of earth crustal movement. Today, when these natural relics become people's tourism resources, when we look up at these natural wonders that cannot be created by man, we can't help but lament the great power of this nature, and the magnificent beauty of this mountain and river. It is worth a visit to Wudalianchi World Geopark, which is the best natural science textbook presented in front of people.