Cataclysmic explosions, fiery lava, primordial power and savage beauty are the frightening yet fascinating seductions that draw us to volcanoes. This large, wonderfully detailed plastic model brings the awesome power and majesty of a stratum-volcano into your classroom. The majority of the world’s active volcanos are of this type. A vertical cross-section reveals the alternating layers of lava and pyroclastic material which produce the distinctive symmetrical step-sided cone. It also shows the course of an eruption which flows through secondary craters. Size: 17 1/2″L x 16 1/2″W x 11″H.