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A kelp forest in Monterey.
Kelp on a beach

Kelp is a type of marine seaweed. It is a brown alga. There are many different kinds of kelp. Kelp grow in large forests, usually near the surface of the water. Some kelps grow very fast (up to 30 cm a day). Kelp can reach a length of up to 60 m. The blades are kept afloat by gas-filled bladders.

Kelp plays an important role as food and habitat for fish and other forms. It may be eaten as a vegetable.