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 grow. Even though the earth's [...]
After reading this essay you will learn about the carbon cycle. Balance is essential to the earth. Chemical cycles keep the amount of elements on the earth in a perfect balance. Carbon is essential for the chemical processes that support life. It plays such an important role in life that sometimes we say that life is "carbon-based". But there is [...]
After reading this essay you will learn about the phosphorus cycle. Phosphorus is an essential nutrient for plants and animals in the form of ions PO43- and HPO42-. It is a part of DNA-molecules, of molecules that store energy (ATP and ADP) and of fats of cell membranes. Phosphorus is also a building block of certain parts of the human [...]