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 Center of the Earth (2008 direct-to-video film) Earth's crust and into the very mantle of the Earth. This is where the operators encounter hidden dangers awaiting them at the Earth's core. The team has to deal with prehistoric creatures in order to both save the research team and to return safely to the surface of the Earth. Journey to the Center of the Earth (2008 direct-to-video film) Journey to the Center of the Earth (released in the UK as Journey to Middle Earth) is a 2008 direct-to-DVD film created by The Asylum and directed by David Jones and Scott Wheeler. The film is a loose adaptation of