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Q: Which part of the ocean layer is the flattest and smoothest in the world?
  • A. Trenches
  • B. Continental slope
  • C. Deep sea plains
  • D. Continental shell
Correct Answer: Option C - Deep sea plains of the ocean layer are the flattest and smoothest in the world. An abyssal plain is an underwater plain on the deep ocean floor. Usually found at depths between 3,000 metres and 6000 metres. Lying generally between the foot of a continental rise and a mid-ocean ridge.
C. Deep sea plains of the ocean layer are the flattest and smoothest in the world. An abyssal plain is an underwater plain on the deep ocean floor. Usually found at depths between 3,000 metres and 6000 metres. Lying generally between the foot of a continental rise and a mid-ocean ridge.

Explanations:

Deep sea plains of the ocean layer are the flattest and smoothest in the world. An abyssal plain is an underwater plain on the deep ocean floor. Usually found at depths between 3,000 metres and 6000 metres. Lying generally between the foot of a continental rise and a mid-ocean ridge.