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) had "some incredibly funny jokes", but noted that the "most hilarious moments" from "When It Rains, It Pours" came from the main characters themselves. Sepinwall enjoyed Jack's videos to his unborn son, noting it was "...the [Jack] I know and love best: supremely confident and ... oblivious to his own insanity." Nathan Rabin of "The A.V. Club" liked that the series had moved on from making the Liz character "asexual and vaguely repellent" for men. In his recap, Rabin much enjoyed the episode and said "If the rest of the season is as good as the first two episodes, we