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 theatrical film) They reach the bottom of a volcanic vent filled with different varieties of crystals, including Diamonds, but learn the floor is actually Muscovite. Sean accidentally drops a diamond, which breaks the Muscovite, and they begin to fall towards the center of the Earth. The vent eventually becomes a water slide which drops them safely into a lake in the center of the Earth, which turns out to be a completely separate world contained within the Earth. The group starts seeking a way back to the surface. Along the way, they find evidence that someone had been there a hundred years