Skip to main content
U.S. flag

An official website of the United States government

Keep up to speed with our Falkor research cruise with this latest seafloor syntax!

Benthic invertebrates captured in a bottom trawl
Benthic invertebrates captured in a bottom trawl. This was from the Ecosystem Shifts in Arctic Seas project.

From June 12 to July 3, the U.S. Geological Survey and Schmidt Ocean Institute will be conducting a research cruise off the coast of Oregon and Washington, hunting deep-sea bubbles and the creatures that eat them. While we post stories about our findings, we’ll also be posting little vignettes like these, in which we serve as your terminology tour-guides to the unusual and hard-to-pronounce words that dwell in the depths of deep-ocean science.

The WaterWord: Benthic Zone


  • How low can you go? Well, no lower than this, anyway. The benthic zone is the lowest ecological zone in a water body, and usually involves the sediments at the seafloor. These sediments play an important role in providing nutrients for the organisms that live in the benthic zone.


  • Benthic comes from the Greek word benthos, meaning “deep of the sea.” Zone, meanwhile, comes from the Greek word zone, meaning “belt,” or “girdle.”

Use/Significance in the Earth Science Community:

  • The benthic zone is a unique ecosystem, and many of the organisms that live in it cannot be found elsewhere in the water column, especially in the deep ocean. Habitats like methane seeps and hydrothermal vents can be found in the benthic zone. In addition, the benthic zone is where all organic material from upper layers of the ocean end up.

U.S. Geological Survey/Schmidt Ocean Institute Use:

  • USGS and SOI are collaborating on a research cruise off the coast of Oregon and Washington that will study methane seeps along the benthic zone. In addition to looking at the nature and chemistry of the seeps, scientists on this cruise will look at the kinds of creatures and organisms that live in the benthic zone along the cruise route.

  • SOI has studied the benthic zone on many of its research cruises, and part of its equipment array is a series of landers that are meant to operate in the benthic zone.

  • USGS scientists have looked at benthic environments all over the country, from the Atlantic and Pacific Oceans to inland rivers.

Next WaterWord: Authigenic

Enjoying our cruise log and blog? Keep up with us on Facebook, Twitter or right here on the USGS website!

Get Our News

These items are in the RSS feed format (Really Simple Syndication) based on categories such as topics, locations, and more. You can install and RSS reader browser extension, software, or use a third-party service to receive immediate news updates depending on the feed that you have added. If you click the feed links below, they may look strange because they are simply XML code. An RSS reader can easily read this code and push out a notification to you when something new is posted to our site.