Volcanic ash and steam spew as it erupted from Mount St. Helens in southwestern Washington state, on May 18, 1980. The Mount Shasta magmatic system has evolved more or less continuously for at least 590,000 years, but the ancestral cone was virtually destroyed by an enormous volcanic sector collapse and landslide around 300,000 years ago. Mount Taranaki has a 50 per cent chance of erupting in the next 50 years, scientists say. In addition one such shield volcano, the 425,000- year-old Cloud Cap volcano, erupted on the north flank of Hood from a vent only 5 kilometers or less from Hood’s summit. The western 1500 km2 of Taranaki is a volcanic landscape that has been constructed from the products of volcanic eruptions principally derived from Mt Taranaki/Egmont (hereafter referred to as Egmont Volcano). ... An enormous volcano four times … Discover Nyiragongo Volcano in Democratic Republic of the Congo: Mount Nyiragongo has erupted at least 34 times since 1882 & is home to the world's largest lava lake. (Public domain.) Mount Ruapehu (/ ˈ r uː ə ˌ p eɪ h uː /; Māori: [ˈɾʉaˌpɛhʉ]) is an active stratovolcano at the southern end of the Taupo Volcanic Zone in New Zealand.It is 23 kilometres (14 mi) northeast of Ohakune and 23 km (14 mi) southwest of the southern shore of Lake Taupo, within Tongariro National Park.The North Island's major ski resorts and only glaciers are on its slopes. Many people are under the mistaken impression that the volcano is a part of another larger volcano, Mauna Loa, but geologists posit it is a volcano of its own, which has its own conduit system and vent. Egmont Volcano last erupted about 200 years ago at the culmination of eight eruptions in the preceding 300 years. Evidence suggests that magma most recently erupted at the surface about 3,200 years ago. Mount St. Helens is a volcano in the state of Washington, seen here in 2004. It erupted in 1980, spewing out more than 1 cubic kilometer of material. In its current cycle, Kilauea has erupted at least 60 recorded times, and has been continually erupting since 1983. Mount Defiance (about 500,000 years old) on the south side of the Columbia River gorge and Lost Lake Butte northwest of Mount Hood are two examples of shield volcanoes.