To determine whether the formation of a ring crater or ring structure is related to the impact of a meteorite, the key is to find out whether the rock of the pit has been subjected to the shock wave accompanied by the strong impact of the meteorite. Under the action of the strong shock wave, the target rock will undergo shock metamorphism. About the meteorite impact In the identification of pits, the international scientific community has identified three diagnostic indicators for shock metamorphism: mineral shattered sheeting, mineral shattered glass, and high-pressure polymorphic transformation of shattered minerals. In nature, in addition to extraterrestrial objects caused by high-speed impacts Except for the shock wave, no other natural process or geological effect can trigger such physical changes in the geological body. If one of the above three indicators can be found in the surface ring geological structure, it can be determined that a meteorite impact has occurred in the area. event. According to this text, for a circular pit or circular structure? ['It can be judged that the meteorite impacted the formation when the minerals changed the glass.', 'Its formation often proves that it has been subjected to strong shock waves.', 'Three diagnostic indicators of shock deterioration usually do not appear at the same time.', 'Strong earthquakes may trigger high-pressure polymorphic transformations of shattered minerals.']