Question

Which of the following processes release carbon dioxide to the atmosphere?

• A. Volcanic eruptions
• B. Respiration
• C. Combustion
• D. Decomposition

Answer 1

Answer: (A), (B), (C), (D)

The correct options are
A Volcanic eruptions
B Respiration
C Combustion
D Decomposition

Volcanic eruptions, respiration and decomposition are all natural processes by which carbon is released into the atmosphere. Carbon dioxide emitted from volcanoes adds to the natural greenhouse effect. When organisms die, they are decomposed by bacteria. Carbon dioxide is released into the atmosphere during decomposition. Burning of fossil fuels is a human intervention into the carbon cycle and is the prime reason for rising carbon levels in our atmosphere.