10 Interesting Facts 
About Earth's Oceans 1. The deepest part of the ocean is 
called Challenger Deep, and it is 
within the Mariana Trench. It is said to have a depth 
of around 36,000 feet. 2. The Denmark Strait cataract, 
Earth's highest underwater waterfall, can be found in 
the Atlantic Ocean and has an 11,500-ft drop. 3. Point Nemo in the Pacific Ocean 
is farthest from any land on Earth. 4. Over $60 billion in 
sunken treasure is said to still be 
in oceans around the world. 5.  There are literal "dead zones" 
that cannot sustain any sea life. 6. 70 percent of the oxygen 
we breathe comes from
marine plants in the oceans. 7. The sea has a blue tint 
because of orange and red 
wavelengths from the sun. 8. Oceanographers have used 
rubber ducks to get a better 
understanding of water currents. 9. The ocean's floor contains cables from 
communications companies that allow 
the internet to travel across the globe. 10. Around 80 percent of 
volcanic eruptions occur under water.