How Earth Recycles: The Four Key Cycles of Matter

Miacademy & MiaPrep Learning Channel

This educational video provides a comprehensive overview of how matter cycles through the Earth's systems, emphasizing the concept of Earth as a "closed system." It begins by posing a thought-provoking question about population growth: if Earth doesn't gain new matter, where do the materials for new life come from? The host then explains the difference between elements and compounds before diving into four specific biogeochemical cycles: the Carbon Cycle, the Nitrogen Cycle, the Phosphorus Cycle, and the Water Cycle. Key themes include the law of conservation of matter, the interaction between Earth's spheres (atmosphere, hydrosphere, geosphere, and biosphere), and the specific biological and chemical processes that drive these cycles. The video details complex processes such as photosynthesis, respiration, combustion, nitrogen fixation, mineralization, nitrification, and weathering, breaking them down with clear visuals and definitions. This resource is highly valuable for middle and high school science classrooms studying ecology, earth science, or chemistry. It effectively connects abstract chemical concepts to real-world phenomena, such as how plants grow, how clouds form, and what our bodies are made of. Teachers can use this video to introduce the concept of nutrient cycling or to review specific vocabulary related to ecosystem dynamics.