Geology of the Rocky Mountains Japan, Indonesia and the Aleutians; others are fragments of oceanic crust obducted onto the continental margin while others represent small isolated mid-oceanic islands. Magma generated above the subducting slab rose into the North American continental crust about inland. Great arc-shaped volcanic mountain ranges, known as the Sierran Arc, grew as lava and ash spewed out of dozens of individual volcanoes. Beneath the surface, great masses of molten rock were injected and hardened in place. For 270 million years, the effects of plate collisions were focused very near the edge of the North American plate boundary, far to the west of
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