Multiple choice

The process of decomposition inside the Earth takes place _____.

  1. in the presence of O2 (oxygen)

  2. in the absence of O2

  3. in the presence of O3 (ozone)

  4. in the absence of CO2
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Decomposition takes place deep under the surface of the earth due to the activity of anaerobic bacteria/microorganisms. Absence of oxygen is a pre-requisite for this.

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