Be sure to click on the Preview for more pictures of what is included in our Ocean Unit. In our ocean studies we exploredā¢ Earthās Systems (overview)ā¢ The Hydrosphere (basic facts)ā¢ Marine Habitatsā¢ Coral Reefs (20 pages in this section)ā¢ Water Form Words (bay, estuary, lagoon, fjord, etc.)ā¢ Features of the Ocean Floor (trench, seamount, guyot, etc.)ā¢ Ocean Navigation (early navigation with astrolabes & the constellations, modern SONAR)ā¢ Salinityā¢ Ocean Currents (Surface & Deep Sea