Scientists probe the ocean floor off Costa Rica and find evidence that may tell us more about what goes on in ocean trenches.

A basic description of the driving force behind plate movement. Describes major features of the ocean floor including mid-oceanic ridges.

This is a comprehensive website featuring how to build a model that illustrates sea-floor spreading and subduction. It has diagrams and pictures reviewing major geological concepts.

This site from the U.S. Geological Survey allows you to access detailed images of the continental margin around the United States. There is additional information about the sonar methods used, and a wealth of additional sources listed.

A short description of the world's deepest ocean trench. Includes diagram and map.

A rather detailed explanation of how trenches form and why. No graphics, but some interesting explanations as well as links to other sites and extensive reference list.

Lengthy illustrated article about the Arctic Ocean discusses all the many features and characteristics of this vast northern ocean--sea ice, icebergs, ice shelves, ice islands, the Arctic Ocean floor, continental shelf--as well as the...

The Abyssal Zone lies deep in the ocean in the pelagic layer between 4,000 to 6,000 m or 13,000 to 19,500 ft. Learn about some of the unique life forms that call this zone their home, how they have adapted to the extreme pressure and...