The diatreme breccia pipes belong to volcanic crater phase and volcanic conduit phase, and consist of breccias and binding material.
There are many noticeable and well-developed joints in the volcanic crater group in the Changle area, and they are unique in shape.
Deep in the Mt. Lingwu, a huge volcanic crater is like a monster, holding its head high in the sky, as if telling about its great achievements.
The small public toilet against the wall was open, and the dung pit was like a volcanic crater surrounded by yellow ice like Mount Fuji.
"Crater Lake:a lake of southwest Oregon in a volcanic crater of the Cascade Range. at 589.3 m (1,932 ft) deep, it is the second-deepest lake in North america. The lake and surrounding parkland are popular tourist attractions."
A flat - bottomed, roughly circular volcanic crater of explosive origin that is often filled with water.