GEOLOGY

Detailed explanation-1: -Aphotic zone is the portion of a lake or ocean where there is little or no sunlight. It is formally defined as the depths beyond which less than 1% of sunlight penetrates.

Detailed explanation-2: -The aphotic zone exists in depths below 1, 000 meters. Sunlight does not penetrate to these depths and the zone is bathed in darkness.

Detailed explanation-3: -In the euphotic zone light intensity supports high levels of photosynthesis. In the disphotic zone light intensity allows vision but only low levels of photosynthesis. In the aphotic zone, sunlight is virtually absent, but there can be light production from organisms (bioluminescence).

Detailed explanation-4: -In the aphotic zone, also called the tropholytic zone, the consumption of energy exceeds its production.

Detailed explanation-5: -The darkness layer or Aphotic Zone is entirely dark meaning there is no light. About 90% of the ocean is in this layer. The whale shark, like most marine organisms, is typically found in the sunlight layer or photic zone of the open ocean layers.