1. The ocean covers more than 70% of the Earth’s surface

With nearly three-quarters of our planet hidden beneath the ocean floor, the oceans play a key role in supporting life on Earth. They regulate the climate, produce half the world’s oxygen, and are home to millions of species.
2. Seamounts and canyons

There are mountains higher than Everest and canyons deeper than the Grand Canyon on the ocean floor. For example, the Mariana Trench goes down almost 11 kilometers, making it the deepest place on Earth.
3. Enormous diversity of species

There are about 2.2 million species in the oceans, and scientists discover new ones every year! Some of the smallest inhabitants are microorganisms and plankton, while among the giants is the blue whale, which can reach up to 30 meters in length.
4. Glowing fish and bioluminescence

In the depths where sunlight does not penetrate, there are fish that can glow thanks to bioluminescence. These species use light to attract prey or scare off predators.
5. The Oldest Fish

The coelacanth is one of the oldest known fish, dating back about 400 million years. This “living fossil” was discovered in 1938 and resembles its ancestors that once crawled out of the water onto land.
6. Seahorses: Unusual Fish

Seahorses are one of the most unique fish: they swim vertically, and the young are carried by the male. In addition, seahorses can change color to blend in with their surroundings and avoid predators.
7. Dolphins Sleep “With Half a Brain”

Dolphins have an amazing ability: they sleep, leaving one half of their brain active to maintain breathing and watch for danger. This allows them to rest while remaining safe.