The Bukidnon plateau is mainly of volcanic zone consisting of pyroclastic, basaltic and andesitic cones. The lava flows consists of trachyandesite, andesite and dacite and pyroclastic deposits. Pyroclastic flows and lahars moved across the countryside. Examples of pyroclastic rocks are tuff and ignimbrite. Associated with these eruptions were pyroclastic flows. Pyroclastic rocks are the product of explosive volcanism. Lake Nyos is surrounded by old lava flows and pyroclastic deposits. The title refers to volcanic airborne pyroclastic rock. Rainier is also capable of producing pyroclastic flows and expelling lava. This period also started with fissural basalts, but ended with violent eruptions of pyroclastic flows. They also occur on the surface of lava or pyroclastic flows. Before the Apollo missions, scientists predicted that they were deposits produced by pyroclastic eruptions. Some volcanoes were explosive with bombs, and pyroclastic tuff. Pyroclastic density currents can also produce ash particles. This volcano is well known for its ash explosions and pyroclastic flows.