Bottlenose dolphins travel in groups called pods, like this one swimming in Hawaii.
Photograph by Flip Nicklin, Minden Pictures
Humans have explored less than 10 percent of the world’s oceans.
Photograph by Vilainecrevette, Dreamstime
The world’s largest coral reef, the Great Barrier Reef in Australia, is visible from space.
Photograph by Tanya Puntti, Dreamstime
About 90 percent of sea creatures living deep in the sea, like this transparent jellyfish, can make their own light.
Photograph by Bill Curtsinger, National Geographic Creative
It's impossible to sink in Israel's Dead Sea—the high salt levels keep people afloat.
Photograph by ProStocker, Shutterstock
Click the full-screen arrows in the upper right corner of the gallery for fun facts related to each photo!
Updated May 5, 2015
Swimming in trash? That's gross and unhealthy—and not just for you. A healthy planet needs a healthy ocean, but our waters face huge risks from overfishing, climate change, and plastic pollution. Luckily, you can help!
This year's World Oceans Day on June 8 is all about saying "no" to plastic trash—and therefore helping protect the ocean. Check out the tips below to find out what you can do to stop plastic pollution (plus other kinds of planet-harming trash) and save the seas.
Here's what you can do to help:
REDUCE YOUR TRASH
Find ways to reuse, donate, or recycle unwanted items instead of tossing them in the landfill.
RESPECT THE BEACH
Always clean up after yourself and consider participating in a local beach cleanup.
TAKE THE BETTER BAG CHALLENGE
Instead of using disposable bags, grab a reusable tote bag when you go shopping. You can even make one out of reused items, like an old T-shirt!
PLEDGE TO THE PLANET
Choose how you’ll contribute by taking the poll on this page.
"WEAR BLUE, TELL TWO"
Participate by wearing blue and telling others two facts about why the ocean is important and how they can help.
Ask a parent to take you to a World Oceans Day event near you.