where was the spiral jetty created before it disappeared due to erosion
Spiral Jetty Built on the northeastern shore of the Great Salt Lake near Rozel Point in Utah entirely of mud, salt crystals, and basalt rocks, Spiral Jetty forms a 1,500-foot-long (460 m), 15-foot-wide (4.6 m) counterclockwise coil jutting from the shore of the lake.
Spiral model This model was first described by Barry Boehm in his 1986 paper "A Spiral Model of Software Development and Enhancement".[2] In 1988 Boehm published a similar paper[3] to a wider audience. These papers introduce a diagram that has been reproduced in many subsequent publications discussing the spiral model.