C1492 Magnificent Volcano(last part)

The crater was indented, covered with solidified volcanic lava that had formed Magmatic Rock, complete with distinct mineral crystal grains and air pockets. Magmatic Rock is a significant component of the Earth's crust, comprising 65% by volume and an even more impressive 95% by mass.

Yet, it's quite rare to encounter Magmatic Rock, as it typically lies beneath layers of soil