Question

what is the primary impact of combustion of fossil fuels on the carbon cycle? it converts co2 into sugars it releases vast amounts of co2 into the atmosphere it dissolves co2 into seawater it decreases atmospheric co2

Explanation:

Combustion of fossil fuels (like coal, oil, and gas) involves burning these fuels. The chemical reaction releases carbon that was stored in the fossil fuels. Since carbon in fossil fuels combines with oxygen during combustion, it forms carbon dioxide ($CO_2$). This $CO_2$ is then released into the atmosphere. Photosynthesis (which converts $CO_2$ into sugars) is done by plants, dissolving $CO_2$ into seawater is a separate process (ocean absorption of $CO_2$ which is affected by factors like ocean chemistry and temperature, not directly by fossil - fuel combustion), and fossil - fuel combustion increases, not decreases, atmospheric $CO_2$.

Answer:

It releases vast amounts of $CO_2$ into the atmosphere.