Seen from space, Earth is breathtaking in its beauty and startling in its solitude. As we look closely at our planet from space, it becomes apparent that Earth is much more than rock and soil. The vast global ocean pay attention to the importance of water on our planet. So when we look at Earth more closer we can see three major spheres: the water portion of our planet, the hydrosphere; Earth’s gaseous envelope, the atmosphere; and, of course, the solid Earth, or geosphere. It should be emphasized that our environment is highly integrated and is not dominated by rock, water, or air alone. It is instead characterized by continuous interactions as air comes in contact with rock, rock with water, and water with air. Sphere of life forms on our planet is called biosphere, it extends into each of three physical realms and is an equally integral part of the planet. Thus, Earth can be thought of as consisting of four major spheres: the hydrosphere, atmosphere, geosphere, and biosphere.…
