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) Don Scardino. This was Carlock's sixteenth writing credit, and Scardino's twenty-eighth directed episode. "When It Rains, It Pours" originally aired in the United States on September 30, 2010, on NBC as the second episode of the show's fifth season and the 82nd overall episode of the series. This episode of "30 Rock" was filmed on August 30, August 31, September 2, September 5, and September 8, 2010. In August 2010, series creator, executive producer and lead actress Tina Fey revealed to "Entertainment Weekly" correspondent Michael Ausiello that actor Paul Giamatti would guest star in the upcoming season playing a "grouchy"