Magma chamber of magma chambers can be mapped using seismology: seismic waves from earthquakes move more slowly through liquid rock than solid, allowing measurements to pinpoint the regions of slow movement which identify magma chambers. As a volcano erupts, surrounding rock will collapse into the emptying chamber. If the chamber's size is reduced considerably, the resulting depression at the surface can form a caldera. Magma chamber A magma chamber is a large pool of liquid rock beneath the surface of the Earth. The molten rock, or magma, in such a chamber is under great pressure, and, given enough time, that pressure can
Journey to the Centre of the Earth (album) with a one-off magazine published by "Classic Rock" and a replica of the 1974 Royal Festival Hall concert program and 132-page booklet. Credits adapted from the album's 1974 liner notes. Musicians Production Citations Sources Journey to the Centre of the Earth (album) Journey to the Centre of the Earth is the third album by English keyboardist Rick Wakeman, released on 3 May 1974 by A&M Records. It is a live recording of the second of his two concerts at the Royal Festival Hall on 18 January 1974, the premiere of his 40-minute orchestral rock piece based on Jules Verne's science