Relief courtesy of National Geophysical Data Center, NOAA
Earth’s continental landscapes—mountains, valleys, canyons—are familiar to students everywhere. But many students do not realize that ocean floor landscapes are equally dramatic and varied.
In the map to the right, which uses a technique called "choropleth mapping" to show depth, areas of darkest blue are the deepest parts of the oceans, while areas of light blue are relatively shallow.
Oceans cover approximately 71% of Earth’s surface. Their average depth is 16,000 feet (4,880 meters). But the ocean floor is marked by mountain chains called "mid-ocean ridges" and deep valleys called "trenches."
Mapping the Ocean Floor Landscape
Provide students with blank world maps.
Have students use National Geographic ocean floor maps to locate and label the following ocean floor features on their outline maps.
Features on the Ocean Floor
Pacific Ocean – Mariana Trench (-35, 827 ft/ -10,920 m.) Japan Trench (-34,318 ft/-10,375 m.); East Pacific Rise (under water ridge)
Atlantic Ocean – Puerto Rico Trench (-28,231 ft./-8,605 m.); Brazil Basin (-20,898 ft./-6,310 m.); Mid-Atlantic Ridge
Indian Ocean – Java Trench (-23,812 ft./-7,258 m.); Mid-Indian Ocean Ridge
Arctic Ocean – Fram Basin (-15,305 ft./-4,665 m.); Lomonosov Ridge
In 2000, the International Hydrographic Organization identified a fifth division in Earth’s oceans—sometimes called the Southern Ocean. This ocean area, which extends from the shores of Antarctica to 60º South latitude, is not universally recognized as a separate ocean. Have students research the so-called Southern Ocean and identify its unique characteristics.
To celebrate the 25th anniversary of the National Geographic Bee, the national finals will be held in a larger DC venue with tickets available to the public. Get your tickets for the May 22 finals and see the top ten students compete live with Alex Trebek moderating.
President surprises students with question on the Nuclear Security Summit.
Alex Trebek takes to the streets of Washington, D.C. to see how well residents know their geography.
For its entire history Mary Lee has overseen the National Geographic Bee. Her determined goal each year is to ensure a fair, fun, and inspiring experience for the geographic students.
Teachers and Parents
Principals of schools in the U.S. with any of the grades four through eight are eligible to register their schools to receive contest materials for a school-level Bee.
Wondering how to register for the Bee or how to prepare? Our "Frequently Asked Questions" have the answers!
What's the best way for students to prepare for the Bee? Here are some tips from the National Geographic Bee.
Answer sample questions from the National Geographic Bee, and get ideas on how to look for clues within the questions that can help you figure out the right answers.
Quizzes to Go
Do you have what it takes to be the next National Geographic Bee Champion? Find out the fun way with the new GeoBee Challenge! Three types of game play make sure you really know your stuff and never get bored.
Google Earth Presents
A look into why geography is important to understand as students around the country prepare for the 2013 National Geographic Bee.
Teachers can use these activities in the classroom to prepare students for the bee!
Simply memorizing terms and place locations can be tedious and even boring. One solution is to make the task fun with an atlas-based scavenger game.
The movement of people, goods, or ideas from one place to another is a process known as diffusion, which plays an important role in shaping the characteristics of where we live.
Springtime brings the possibility of extreme weather, including violent thunderstorms and tornadoes.