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What natural geochemical process converts atmospheric CO2... | QuestionStock

Representative image for question: What natural geochemical process converts atmospheric CO2 into bicarbonate ions that can be transported to oceans and ultimately stored as carbonate sediments?

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What natural geochemical process converts atmospheric CO2 into bicarbonate ions that can be transported to oceans and ultimately stored as carbonate sediments?

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What natural geochemical process converts atmospheric CO2 into bicarbonate ions that can be transported to oceans and ultimately stored as carbonate sediments?

Options:

Photosynthetic carbon fixation
Oxidation of methane hydrates
Silicate (chemical) weathering
Volcanic degassing

Correct answer: Silicate (chemical) weathering

Explanation: Silicate weathering is a CO2-consuming chemical reaction where CO2 and water react with silicate minerals to form bicarbonate; this mechanism helps sequester CO2 on geological timescales and is temperature- and runoff-dependent.

Created 2026-03-10T17:17:10.205Z. Updated 2026-03-10T17:17:10.205Z.