The constant recycling of atoms that sustains all life on Earth
In short: Life depends on a closed loop. This video explains how essential elements like carbon and water are perpetually reused through biological and geological processes, ensuring the planet's resources never truly run out.
The Earth functions as a massive recycling system where atoms in organisms are constantly reused. The water cycle moves moisture from lakes and oceans into the atmosphere via evaporation and plant transpiration, eventually returning to land as precipitation. This continuous movement ensures that water remains available for life across different environments.
Carbon follows a similar path of exchange between living things and the environment. Plants and algae pull carbon dioxide from the air through photosynthesis, while animals and microorganisms release it back during respiration. Carbon also moves through consumption, decomposition by microbes, and combustion. Over long periods, organic matter can undergo fossilisation to become fuel, which is later released into the atmosphere when burned.
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Sources
- Summary by Intellect · source: GCSE Biology - Carbon Cycle & Water Cycle (2027/28 exams)
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