gen-briefly-explain-the-carbon-cycle-in-rocks-and-one-common-mis-d7f8

Briefly explain the carbon cycle in rocks and one common misconception about it.

# The Carbon Cycle in Rocks **The Basic Process:** The rock carbon cycle operates over millions of years. Carbon dioxide from the atmosphere dissolves in rainwater, forming weak carbonic acid that weathers rocks. This carbon is carried by rivers to the ocean, where marine organisms use it to build shells and skeletons (calcium carbonate). When these organisms die, their remains accumulate on the seafloor, eventually forming sedimentary rocks like limestone. Through subduction and volcanic activity, this carbon returns to the atmosphere as CO₂, completing the cycle. ## Common Misconception **Misconception:** "The rock carbon cycle can solve current climate change by absorbing excess CO₂ quickly." **Reality:** The rock carbon cycle operates on timescales of hundreds of thousands to millions of years. While it does naturally regulate Earth's climate over geological time, it's far too slow to offset the rapid CO₂ emissions from human activities happening over decades. Chemical weathering might remove only about 1% of annual human CO₂ emissions, making it irrelevant as a solution to contemporary climate change.