For 10 points, name this type of opening in the Earth's crust through which lava erupts.
Mayon, a strato-type of this structure in the Philippines, is nearly perfectly conical. Explosions in these structures can cause tephra, which is classified by size into lapilli, pyroclastic blocks, and (*) ash. The shield variety is formed by basalt buildup, and they can be found at Mt. Vesuvius, Mauna Loa, and around the Ring of Fire. For 10 points, name this type of opening in the Earth's crust through which lava erupts.
Mayon, a strato-type of this structure in the Philippines, is nearly perfectly conical.
volcanoes