Earthen structures are buildings made primarily from natural materials like soil, clay, and sand. These structures can take various forms, including adobe, cob, and rammed earth. They are known for their sustainability, as they utilize locally available resources and have a low environmental impact. These types of buildings offer excellent thermal mass, helping to regulate indoor temperatures and reduce energy consumption. Earthen structures are often found in traditional architecture around the world, showcasing the adaptability and resilience of these materials in different climates and cultures.