Final answer:
Robert Smithson created 1. Spiral Jetty in 1970 in the Great Salt Lake, Utah. It is a site-specific piece of Land Art or Earth Art, consisting of a spiral-shaped jetty made from rocks, earth, and salt.
Step-by-step explanation:
Robert Smithson created 1. Spiral Jetty in 1970 in the Great Salt Lake, Utah. It is a site-specific piece of Land Art or Earth Art, consisting of a 1,500-foot long spiral-shaped jetty made from rocks, earth, and salt.
The artwork is altered by the shifting waters of the lake over time, making it forever linked to the environment.