Multiple choice

Which one of the following is the uppermost region of pelagic part of aphotic zone?

  1. Thermocline

  2. Mesopelagic

  3. Bathypelagic

  4. Hadalpelagic

  5. Abyssopelagic

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Mesopelagic is the uppermost region and its lowermost boundary is at a thermocline of 12 °C.