Land, air, and water are the three essential components of Earth's environment. Land includes all solid surfaces, such as mountains, valleys, and plains, where plants and animals live. It provides habitats and resources for various ecosystems and human activities. Air is the invisible mixture of gases surrounding the Earth, primarily composed of nitrogen and oxygen. It is vital for the survival of living organisms, as it enables respiration and supports weather patterns. Water covers about 71% of the Earth's surface, existing in oceans, rivers, and lakes, and is crucial for all forms of life, agriculture, and industry.