12 Incredible Facts About the Ocean

1. More than half of Earth's oxygen comes from the ocean and not from trees. It comes from marine photosynthesizers like phytoplankton and seaweed. https://ocean.si.edu/ocean-life/plankton/every-breath-you-take-thank-ocean 2. If you think we've discovered everything the Earth has to offer, think again. More than 80% of our ocean is unmapped, unobserved, and unexplored. https://oceanservice.noaa.gov/facts/exploration.html 3. The longest mountain range on Earth is called the "mid-ocean ridge." About 90% of the mid-ocean ridge system is under the ocean and spans 40,389 miles around the globe. https://oceanservice.noaa.gov/facts/midoceanridge.html 4. The Mariana Trench is so deep that if Mount Everest was placed into the trench at its deepest point, its peak would still be over two kilometers (1.2 miles) under water. https://en.wikipedia.org/wiki/Mariana_Trench 5. Due to different levels of water density, there exist underwater "rivers" in the ocean. One such "river" was discovered off the Yucatan Peninsula, Mexico. https://www.youtube.com/watch?v=iHBvKDOfWiI