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.
Join 11,000 schools and participate in this year’s National Geographic Bee. Get a notification to alert you when registration opens in August.
About the National Geographic Bee
Each year thousands of schools in the United States participate in the National Geographic Bee using materials prepared by the National Geographic Society. The contest is designed to inspire students to be curious about the world. Schools with students in grades four through eight are eligible for this entertaining and challenging competition.
The national championship preliminary rounds took place on Monday, May 23, in Washington, D.C. The national championship final rounds featuring the top 10 finalists and moderated by humorist, journalist, and actor Mo Rocca were held on Wednesday, May 25, at National Geographic’s Washington, D.C., headquarters.
The national champion receives a $50,000 college scholarship, a lifetime membership in the National Geographic Society, and a Lindblad expedition to Southeast Alaska provided by Lindblad Expeditions and National Geographic.
Watch the 2016 National Geographic Bee Finals
The National Geographic Bee aired on the National Geographic Channel on Friday May 27, and may still be available via streaming services. It is also airing on public television stations; check local television listings for dates and times.
Meet the 2016 Champions
National Geographic Bee contestants aren't just geography geniuses. They're also savvy park planners! See where they would create a National Park in their own state.
Host Mo Rocca interviews the Top 10 Finalists on stage during the 2016 competition.
How to Help
Donations help fund schools to participate in the National Geographic Bee.
Teachers can use these activities in the classroom to prepare students for the bee!
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