Ocean Facts for Kids
Deep-sea facts and ocean wonders
The ocean covers more than 70% of Earth's surface, but we've only explored about 5% of it.
The Great Barrier Reef is the largest living structure on Earth — it can be seen from space!
The deepest point in the ocean, the Mariana Trench, is deeper than Mount Everest is tall.
Jellyfish have been around for more than 500 million years — older than dinosaurs!
The blue whale's heart is so big that a small child could crawl through its arteries.
Starfish don't have a brain — they use a complex nervous system to sense the world around them.
Coral reefs support about 25% of all marine life, even though they cover less than 1% of the ocean floor.
Sea cucumbers breathe through their bum.
The ocean produces over 50% of the world's oxygen through tiny plants called phytoplankton.
Giant squid have eyes the size of dinner plates — up to 10 inches across!