Which best describes a natural process that adds carbon dioxide to the atmosphere?

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Prepare for the AP Environmental Science Exam. Study with quizzes and multiple choice questions covering atmospheric pollution. Each question offers helpful hints and detailed explanations to boost your knowledge and confidence. Tackle the exam with assuredness!

Multiple Choice

Which best describes a natural process that adds carbon dioxide to the atmosphere?

Explanation:
Volcanic eruptions release carbon dioxide stored deep in Earth’s interior into the atmosphere, making it a direct natural source of CO2. Photosynthesis removes CO2 by converting it into organic matter, and dissolving CO2 in oceans also lowers atmospheric CO2, so they’re sinks rather than sources. While respiration by animals does release CO2, the clearest natural process that adds CO2 directly to the air is outgassing from volcanic activity.

Volcanic eruptions release carbon dioxide stored deep in Earth’s interior into the atmosphere, making it a direct natural source of CO2. Photosynthesis removes CO2 by converting it into organic matter, and dissolving CO2 in oceans also lowers atmospheric CO2, so they’re sinks rather than sources. While respiration by animals does release CO2, the clearest natural process that adds CO2 directly to the air is outgassing from volcanic activity.

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