There are a variety of ways to refer to art that is created using materials found in the natural world, including "earth art," "land art," and "environmental art." These terms all describe a genre of art that aims to work in harmony with nature, often utilizing natural elements like rocks, sand, or plants to create sculptures or installations that blend with their surroundings. "Earth art" specifically emphasizes the use of earthy materials like soil, clay, or mud, but all of these terms ultimately refer to a form of art that encourages a deeper connection between humans and the earth.