Robert Smithson, an American artist, is considered one of the pioneers of Land Art. His iconic work, "Spiral Jetty," created in 1970, is a large-scale earthwork located in Utah's Great Salt Lake.

Land Art primarily utilizes natural materials found in the environment, such as rocks, soil, plants, and water. Artists work with these materials to create site-specific installations that interact with the landscape.

Double Negative, created by Michael Heizer in 1969, is a large-scale earthwork located in the Nevada desert. It consists of two trenches cut into the desert floor, forming a negative space that interacts with the surrounding landscape.

Land Art serves multiple purposes, including beautifying the environment, raising awareness about environmental issues, and providing a platform for artistic expression. It encourages viewers to engage with the natural world and contemplate the relationship between art and nature.

7,000 Oaks, created by Joseph Beuys in 1982, involved the planting of 7,000 oak trees in a grid pattern in Kassel, Germany. This project aimed to raise awareness about environmental issues and promote ecological regeneration.

The Lightning Field, created by Walter De Maria in 1977, is a large-scale earthwork located in the New Mexico desert. It consists of 400 stainless steel poles arranged in a grid pattern, attracting lightning strikes during thunderstorms.

Roden Crater, created by James Turrell, is a large-scale earthwork located in the Arizona desert. It involves the transformation of a volcanic crater into an observatory for celestial events, allowing viewers to experience the sky and stars in a unique way.

A Line Made by Walking, created by Richard Long in 1967, involved a long walk across the English countryside, leaving a visible trace of his journey through the landscape.

Earth Room, created by Walter De Maria in 1977, involved the creation of a room filled with soil, inviting viewers to experience the materiality and weight of the earth.

Land Art primarily focuses on exploring the relationship between art and nature, using natural materials and landscapes as a medium for artistic expression. It challenges traditional notions of art and encourages viewers to engage with the environment in new ways.

Spiral Jetty, created by Robert Smithson in 1970, is a large-scale earthwork located in Utah's Great Salt Lake. It consists of a spiral-shaped jetty made of black basalt rocks, extending into the lake and interacting with the surrounding landscape.

Wrapped Coast, created by Christo and Jeanne-Claude in 1969, involved the wrapping of a portion of the coastline in Australia with fabric, highlighting the relationship between art and the environment.

Crop Circles, created by unknown artists, are large-scale earthworks in the form of geometric patterns created by flattening crops in fields. They have become a subject of fascination and speculation, often associated with extraterrestrial phenomena.

Sun Tunnels, created by Nancy Holt in 1973-76, involves the use of four large concrete tunnels with circular openings, aligned with the sunrise and sunset on the summer and winter solstices. The tunnels frame the surrounding landscape, creating a unique visual experience.

Mounds of Earth, created by Robert Morris in 1968, involved the creation of a series of mounds made of earth and gravel, arranged in a grid pattern. This project explored the relationship between form and space, as well as the impact of human intervention on the natural landscape.