surface water
type: Concept
narrower: oceans

geomorphology
type: Concept
narrower: oceans

concepts
type: Collection
type: ConceptGroup
member: oceans

oceans
type: Concept
definition: Oceans cover 71 percent of the earth's surface and contain 97 percent of the planet's water. Over 20 percent of the world's petroleum is derived from offshore sources, and 95 percent of world trade by weight—or two-thirds by value—is carried by ship. [Source: Encyclopedia of Environment and Society; Oceans]
broader: surface water
broader: geomorphology