Multiple choice

Consider the following:

  1. Photosynthesis
  2. Respiration
  3. Decay of organic matter
  4. Volcanic action

Which of the above add carbon dioxide to the carbon cycle on Earth?

  1. 1 and 4

  2. 2 and 3

  3. 2, 3 and 4

  4. 1, 2, 3 and 4
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Carbon is released into the atmosphere in several ways such as: Respiration, Decay of animal and plant matter, Burning of fossil fuels such as coal, petroleum products and natural gas, Production of cement, Volcanic eruptions and Metamorphism. Volcanic gases are primarily water vapour, carbon dioxide and sulphur dioxide, etc.  Photosynthesis is a chemical process that converts carbon dioxide into organic compounds, especially sugars, using the energy from sunlight.

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