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What is Understanding the Earth about?
The biosphere is the thin layer of Earth where life exists, extending from 10 km above sea level to over 8 km below the ocean surface. It includes the atmosphere, lithosphere, hydrosphere, and all ecosystems interacting as a single unit. The biosphere emerged around 3.5 billion years ago with the evolution of photosynthetic prokaryotes that introduced oxygen. It has since developed into a complex system with food webs and nutrient cycling that make it self-sustaining. However, human activities like deforest
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- api-423260675
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- EN