surface water
type: Concept
narrower: rivers

rivers
type: Concept
definition: Rivers, or large natural waterways, have been used by man since prehistoric times. Remains of early man, such as those found by Louis Leakey in Kenya, have often been located in or near what had been river beds, as have pieces of flints used by prehistoric man during the Stone Age. [Source: Encyclopedia of Environment and Society; Rivers]
broader: surface water
broader: running water
broader: geomorphology
broader: geological phenomena

running water
type: Concept
narrower: rivers

geomorphology
type: Concept
narrower: rivers

geological phenomena
type: Concept
narrower: rivers

concepts
type: Collection
type: ConceptGroup
member: rivers