The ocean provides a vast living space with diverse and unique ecosystems from the surface, through the water column, and down to and below the seafloor. Most of the living space on Earth is in the ocean.

Exploring Our Fluid Earth, a product of the Curriculum Research & Development Group (CRDG), College of Education. University of Hawai?i, 2011. This document may be freely reproduced and distributed for non-profit educational purposes.