Archaeological discoveries

Is a cave shell structure?

A cave is not a shell structure. Shells are hard, protective outer layers produced by some animals, primarily mollusks. Caves, on the other hand, are natural underground hollows formed by various geological processes, such as erosion by water, wind, or volcanic activity. Caves may have different rock formations and structures within them, such as stalactites and stalagmites, but these are mineral deposits rather than shells.