Alaska is a land of extremes—of rugged mountains and thick forests, of ice and fire. Taken together, it is a land of breathtaking beauty. It is as diverse as it is huge. The Alaskan environment can be studied as four spheres: the lithosphere, the atmosphere, the hydrosphere, and the biosphere. These spheres can be considered independently. But they also influence each other as they create a wealth of natural wonders.
Which of the six essential elements of Geography is discussed here? What information is presented that helped you determine which element is being discussed?