Robert Smithson is considered a pioneer of Land Art for his groundbreaking work, 'Spiral Jetty', created in 1970.

Christo and Jeanne-Claude's 'Running Fence' was a 24.5-mile-long fabric fence installed in Sonoma and Marin counties, California.

Michael Heizer is renowned for his large-scale earthworks, including the 'Double Negative' and 'City'. He often uses geometric shapes in his works.

Land Art's relationship to the natural environment is significant because it emphasizes the beauty of nature, challenges traditional notions of art, and promotes environmental conservation.

Richard Long is known for his ephemeral works that involve walking or tracing lines in the landscape, using natural materials.

James Turrell's 'Roden Crater' is a large-scale land art installation located in Arizona, which involves a series of tunnels and chambers that align with celestial events.

Nancy Holt is known for her land art works that explore the relationship between art and science, often incorporating scientific concepts and data into her installations.

Christo and Jeanne-Claude's 'The Gates' was a temporary public art installation in Central Park, New York City, consisting of 7,500 saffron-colored fabric gates.

Michael Heizer is known for his land art works that involve the movement of earth and other natural materials, often on a large scale.

Robert Smithson's 'Spiral Jetty' is a large-scale land art installation located in Utah, consisting of a 1,500-foot-long spiral jetty made of black basalt rocks.

Richard Long is known for his land art works that involve the use of natural materials, often in a minimalist style, creating ephemeral works that emphasize the relationship between art and nature.

Walter De Maria's 'The Lightning Field' is a land art installation located in New Mexico, consisting of 400 stainless steel poles arranged in a grid, designed to attract lightning strikes.

Robert Smithson is known for his land art works that explore the relationship between art and time, often using natural materials that change over time or creating works that are intended to be ephemeral.

Nancy Holt's 'Sun Tunnels' is a land art installation located in Utah, consisting of four large concrete tunnels aligned with the solstices and equinoxes, allowing sunlight to pass through and create a unique visual experience.

James Turrell is known for his land art works that involve the use of light and space, often creating immersive experiences that play with perception and the viewer's relationship to the environment.