After reading this essay you will learn about the oxygen cycle. The oxygen cycle is the biogeochemical cycle that describes the movement of oxygen within and between its three main reservoirs; the atmosphere (air), the biosphere (living things), and the lithosphere (Earth’s crust). The main driving factor of the oxygen cycle is photosynthesis, which is […]
Oxygen Cycle: Essay on the Oxygen Cycle | Earth | Geography
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Nitrogen Cycle: Essay on the Nitrogen Cycle | Earth | Geography
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After reading this essay you will learn about the nitrogen cycle. Nitrogen atoms are constantly moving in a giant circle from the air, through the soil, into the bodies of plants and animals, and eventually back to the air. This whole process is called the nitrogen cycle. All living things need nitrogen to develop and […]
Essay on the Plate Tectonics Theory | Earth | Geography
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After reading this essay you will learn about the plate tectonics theory. Plate Tectonic theory is based on an earth model characterized by a small number of lithospheric plates, 70 to 250 km (40 to 150 mi) thick, that float on a viscous under-layer called the asthenosphere. These plates, which cover the entire surface of […]