1. What is an Ocean: An ocean is a massive body of saltwater that covers over 70 percent of Earth's surface, making our planet look like a stunning blue marble from outer space: it is our world's biggest feature.

2. The Big Five: Instead of lots of separate bodies of water, all the world's oceans are actually connected into one giant global ocean that is broken up into five main parts: the Pacific, Atlantic, Indian, Southern, and Arctic.

3. The Deepest Place on Earth: The deepest part of the ocean is called the Mariana Trench, and it plunges so far down that you could drop Mount Everest right into it and still have thousands of feet of water above the peak: it is an extreme underwater abyss.

4. Underwater Mountain Ranges: The ocean floor isn't just flat and sandy; it features the longest mountain range in the world called the Mid-Ocean Ridge, which stretches for over 40,000 miles right along the bottom of the sea: it is a hidden mountain chain.

5. Home to Most Life: The ocean is the biggest habitat on Earth and is home to millions of incredible species, from tiny glowing plankton to massive blue whales: it is a bustling underwater metropolis.

6. Earth's Lungs: Microscopic floating plants in the ocean called phytoplankton produce more than half of all the oxygen on Earth through photosynthesis, meaning every other breath we take comes from the sea: they keep us breathing.

7. Glowing Creatures: Many deep-sea animals have a special superpower called bioluminescence, which lets them create their own twinkling, neon light in the pitch-black darkness of the deep ocean: they bring their own glow-sticks.