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Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now! https://www.khanacademy.org/science/grade-8-science-tx/x3cd7525f789ab4f1:climate-change/x3cd7525f789ab4f1:the-carbon-cycle/v/the-carbon-cycle

Carbon moves through the environment in a continuous cycle, shifting between reservoirs such as plants, animals, soil, air, water, and rocks. Key processes—photosynthesis, respiration, decomposition, and combustion—drive this movement. While the biological carbon cycle happens quickly, the geological carbon cycle takes millions of years. Human actions can disrupt this cycle, contributing to climate change.

Sections:
00:00 Intro
01:08 Biological carbon cycle
02:30 Geological carbon cycle
03:46 Summary

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Credit:
“Formation of coal” by Steven Earle, licensed under a Creative Commons Attribution License (CC BY-SA 4.0): https://commons.wikimedia.org/wiki/File:Formation_of_coal.png