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
The Edge of the Earth The Edge of the Earth The Edge of the Earth is an extended play by American rock band Switchfoot, released digitally on September 9, 2014 through lowercase people/Atlantic. It consists of previously unreleased songs from Switchfoot's rock documentary film "Fading West". The EP has debuted at number 39 on the US "Billboard" 200 chart, and reached top 10 positions on "Billboard" Christian Albums, Soundtrack Albums and Top Alternative Albums charts. The first song on the record, "Fading West", is the only track that had been previously released, as the song was included on the physical edition of the "Fading West