Volcano were proposed for volcano behavior before the modern understanding of the Earth's mantle structure as a semisolid material was developed. For decades after awareness that compression and radioactive materials may be heat sources, their contributions were specifically discounted. Volcanic action was often attributed to chemical reactions and a thin layer of molten rock near the surface. Volcano A volcano is a rupture in the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface. Earth's volcanoes occur because its crust is broken into 17 major,
When It Rains, It Pours (30 Rock) When It Rains, It Pours (30 Rock) "When It Rains, It Pours" is the of the fifth season of the American television comedy series "30 Rock", and the 82nd overall episode of the series. It was written by co-show runner and executive producer Robert Carlock and directed by series producer Don Scardino. "When It Rains, It Pours" originally aired on the National Broadcasting Company (NBC) network in the United States on September 30, 2010. Guest stars in this episode include Joanna Adler, Ben Bailey, Elizabeth Banks, Craig Castaldo, Paul Giamatti, Andrea Mitchell, Chris Parnell, Sherri Shepherd, and Brian Williams. In