The surface of the planet is approximately 71% water and contains (5) five oceans, including the Arctic, Atlantic, Indian, Pacific and Southern. Their borders are indicated on the world image (above) in varied shades of blue.
For many years only (4) four oceans were officially recognized, and then in the spring of 2000, the International Hydrographic Organization established the Southern Ocean, and determined its limits. Those limits include all water below 60 degrees south, and some of it, like the Arctic Ocean, is frozen.
The 5 Oceans by Size
Greatest Depths in the Ocean
- Mariana Trench, Pacific 35,827 ft
- Puerto Rico Trench, Atlantic 30,246 ft
- Java Trench, Indian 24,460 ft
- Arctic Basin, Arctic 18,456 ft
- Southern Ocean, 23,737 ft
Planet Earth Details
- Surface Area of the Planet (510,066,000 sq km)
- Land Area on the Planet (148,647,000 sq km) 29.1%
- Ocean Area (335,258,000 sq km)
- Total Water Area (361,419,000 sq km) 70.9%
- Type of Water (97% salt), (3% fresh)
This image of the Pacific Ocean seafloor and land elevations was created by the World Data Center for Geophysics & Marine Geology (Boulder, CO), National Geophysical Data Center, NOAA.
The large series of volcanoes (some active) encircling the Pacific Ocean are referred to as being part of the Ring of Fire, and notorious for frequent earthquakes and volcanic eruptions.
The Ring of Fire coinciding with the edges of one of the world's main tectonic plates, (the Pacific Plate) contains over 450 volcanoes and is home to approximately 75% of the world's active volcanoes.
Nearly 90% of the world's earthquakes occur along the Ring of Fire; most recently, the devasting quakes in Chile, Japan and New Zealand.