-Marine regions cover about three-fourths of the Earth’s surface and include oceans, coral reefs, and estuaries
-Oceans are the largest of all the ecosystems, oceans are very large bodies of water that dominate
the Earth’s surface.
They have four zones: intertidal, pelagic, abyssal, and benthic.
-Intertidal is where the ocean and land meet. Pelagic is the open ocean. Benthic is below the
pelagic zone, but not the deep parts. Abyssal zone is the deep ocean.
-Coral reefs are widely distributed in warm shallow waters.
-Estuaries are areas where freshwater streams or rivers merge with the ocean.