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
Beneath the Gated Sky Beneath the Gated Sky Beneath the Gated Sky is a science-fiction novel by Robert Reed, first published in 1997. It describes a world in which the sky undergoes a transformation that prevents people from seeing the stars, giving them instead a view of the other side of the world, as if the Earth had been turned inside out. The entire universe seems to have been rebuilt by an intelligence so that each body of matter exists in a structure that connects all matter together allowing travel between worlds using "quantum intrusions". The intrusions only allow minds, or as some would