marine geology Marine geology or geological oceanography is the study of the history and structure of the ocean floor. It involves geophysical, geochemical, sedimentological and paleontological investigations of the ocean floor and coastal zone. Marine geolog ...

, a knoll is defined as a rounded underwater hill, not exceeding 1000 meters in height. Any rounded underwater features exceeding that height are referred to as seamounts. They are believed to cover around 16.3% of the world's seafloor.

Examples

* Orphan Knoll *

Graveyard Seamounts The Graveyard Seamounts, officially known as the Graveyard Knolls, are a series of 28 small seamounts ( underwater volcanoes) and edifices located on the Chatham Rise, east of New Zealand. They cover about and stand out from the surrounding ocea ...

References

Oceanographical terminology Seamounts {{Ocean-stub