nitrogen cycle

Discovery Science: Cycle of Matter – Phosphorus Cycle and Water Cycle

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Earth Science: Cycle of Matter – Phosphorus Cycle and Water Cycle Phosphorus plays an important role for all organisms in many processes involving energy transfer and energy maintenance. In addition, water is an indispensable component in all activities of life’s processes. Phosphorus, which occurs in nature almost exclusively in the form of organic compounds or … Read more

Pocket Genius Science: The living world – Cycles

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Facts At Your Fingertips: The living world – Cycles Every living thing needs the elements oxygen and carbon to grow and make energy. These elements are constantly passing from the air into living things and back into the air again in cycles that are essential to life. The oxygen cycle Plants release oxygen into the … Read more