Question

some processes cycle carbon into the atmosphere, some processes remove carbon from the atmosphere and some cycle carbon both into and out of the atmosphere. drag and drop the following processes into the correct category of cycling carbon into or out of the atmosphere. some choices may be used more than once or not at all. (2 points) cycle carbon into the atmosphere cycle carbon out of the atmosphere burning fossil fuels photosynthesis limestone formation respiration equilibrium with the ocean

Explanation:

To solve this, we analyze each process:

• Burning fossil fuels: Releases carbon dioxide ($\ce{CO_2}$) into the atmosphere (combustion of hydrocarbons produces $\ce{CO_2}$).
• Respiration: Organisms release $\ce{CO_2}$ during respiration (glucose + oxygen → carbon dioxide + water + energy), so it cycles carbon into the atmosphere.
• Photosynthesis: Plants take in $\ce{CO_2}$ from the atmosphere to produce glucose and oxygen (carbon out of atmosphere).
• Limestone formation: Involves the deposition of calcium carbonate (from marine organisms), which removes carbon from the atmosphere (as $\ce{CO_2}$ is used in the process).
• Equilibrium with the ocean: The ocean can both absorb (out) and release (in) $\ce{CO_2}$ depending on conditions, but in the context of carbon cycling categories here, it's often considered as a process that can cycle both (but for the given categories, we analyze direction: when absorbing, it's out; when releasing, it's in. However, for the drag - drop, we categorize based on the primary or typical direction for each process in the carbon cycle).

Now, categorizing:

• Cycle carbon into the atmosphere:
• Burning fossil fuels: Releases $\ce{CO_2}$ into the air.
• Respiration: Living organisms (plants and animals) release $\ce{CO_2}$ during respiration.
• Cycle carbon out of the atmosphere:
• Photosynthesis: Plants use $\ce{CO_2}$ to make glucose.
• Limestone formation: Removes $\ce{CO_2}$ from the atmosphere (through the formation of calcium carbonate).
• Equilibrium with the ocean (when the ocean absorbs $\ce{CO_2}$, it's out of the atmosphere; although it can release, in the carbon cycle context for this question, it's categorized as out when considering the removal aspect for the purpose of this drag - drop).

Answer:

• Cycle carbon into the atmosphere: burning fossil fuels, respiration
• Cycle carbon out of the atmosphere: photosynthesis, limestone formation, equilibrium with the ocean