“Earth Art: An umbrella term for related movements originating in the mid-1960s in which substances like dirt, rocks, snow, and grass are embraced as the artist’s media. Works range in size from gallery pieces to large tracts of land, such as Robert Smithson’s Spiral Jetty (1970), which jutted 1,500 feet into the Great Salt Lake. As with many site-specific works, these may be known to the public primarily through photographic documentation. Amalgams from the 1980s have resulted in new trends termed eco-feminism, eco-Dada, and environmental protest art. Compare Environment Art.”
Excerpted from: Diamond, David G. The Bulfinch Pocket Dictionary of Art Terms. Boston: Little Brown, 1992.