OtterKnow Kids Encyclopedia

Seaweed is a name for many different types of plants and algae that grow in the ocean, and there are over 10,000 kinds! It can be green, brown, or even bright red and pink. Seaweed is super important for our planet because it makes a lot of the oxygen we breathe, just like trees do on land.

Seaweed does not have roots like land plants. Instead, it has a special part called a “holdfast” that helps it cling to rocks so it does not wash away in the waves. It has flat, slippery parts called “blades” that soak up sunlight from the water. Some seaweed can grow longer than a school bus!