The earth's surface is a complex zone in which three main components of the environment meet, overlap, and interact. These are the lithosphere (solid portion of the earth on which we live) , Atmosphere (gaseous layers that surround the earth) , and Hydrosphere (area of the Earth's surface having water on it). The Biosphere is the narrow zone where we find land, water, and air together, which contains all forms of life. A. Lithosphere (स्थलमंडल) The lithosphere comprises the rocks of the earth’s crust and the thin layers of soil that contain nutrient elements that sustain organisms. There are two main divisions of the earth’s surface. The large landmasses are known as the continents and the huge water bodies are called the ocean basins . All the oceans of the world are connected with one another. The level of seawater remains the same everywhere . Elevation of land is measured from the level of...