C1492 A Magnificent Volcano(last Part)

The bowl was caved in, and the Magmatic Rock was covered with solidified volcanic lava. There were obvious mineral crystals or air holes, and the Magmatic Rock was also an important part of the earth's crust. Its volume was 65%, and its mass ratio was 95%.

However, it was usually very difficult to see the Magmatic Rocks. They were all scattered under the soil layer