11. It is composed of pyroclastic cones , lava domes and maars, and rises to. 12. Mount Raiden is a pyroclastic cone . 13. Mount Mekunnai is a pyroclastic cone . 14. Tuff rings, pyroclastic cones of primarily ash, are built by explosive disruption of rapidly cooled magma. 15. An overlapping pair of pyroclastic cones sits on top of the Chao flow and form its eruption vent. 16. The island developed initially from a submarine volcano from the Pleistocene period that constructed small calderas and numerous pyroclastic cones . 17. The basaltic La Grille volcano also differs from Karthala in its abundance of pyroclastic cones up to 800m in height. 18. Four pyroclastic cones are present within the 2 x 3 km caldera at the central and northwestern part of the summit. 19. The plateau includes many small pyroclastic cones caused by explosions when water penetrated downward and came into contact with fresh lava. 20. It is a stratovolcano with fumaroles around the summit, which may be either a lava dome or a pyroclastic cone .
