When seaweed or seagrass lose their grip on the rocks or sand they will float in the water. Waves will wash any floating material onto the beach.
On the beach the seaweed and seagrass will start to rot and can become smelly. There can be tiny hopping animals that eat and live among thick mats of rotting seaweed.
You should always take care when looking through rotting seaweed. Rubbish, sharp objects and even fishhooks can be hidden among the seaweed.
How many different kinds of seaweed can you find at your next beach visit?