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) Icelandic alchemist. Wakeman performs with the London Symphony Orchestra, the English Chamber Choir, and a group of hand-picked musicians for his rock band, which later became the English Rock Ensemble. Actor David Hemmings narrates the story. "Journey to the Centre of the Earth" was overall well received by music critics. It reached No. 1 on the UK Albums Chart, the first album from A&M to do so, and peaked at No. 3 on the "Billboard" 200 in the United States. It was certified gold by the Recording Industry Association of America in October 1974 for selling 500,000 copies. The album