Shield volcano are cave-like volcanic straights formed by the hardening of overlaying lava. These structures help further the propagation of lava, as the walls of the tube insulates the lava within. Lava tubes can account for a large portion of shield volcano activity; for example, an estimated 58% of the lava forming Kīlauea comes from lava tubes. In some shield volcano eruptions, basaltic lava pours out of a long fissure instead of a central vent, and shrouds the countryside with a long band of volcanic material in the form of a broad plateau. Plateaus of this type exist in Iceland, Washington, Oregon,
Under the Volcano Under the Volcano Under the Volcano is a novel by English writer Malcolm Lowry (1909–1957) published in 1947. The novel tells the story of Geoffrey Firmin, an alcoholic British consul in the small Mexican town of Quauhnahuac, on the Day of the Dead, 2 November 1938. The book takes its name from the two volcanoes that overshadow Quauhnahuac and the characters, Popocatepetl and Iztaccihuatl. "Under the Volcano" was Lowry's second and last complete novel. The novel was adapted for radio on "Studio One" in 1947 but had gone out of print by the time Lowry died. Its popularity restored, in