Marine mucilage is like boogers in the ocean. Just like how our nose produces boogers when we have allergies or a cold, the ocean produces mucilage too when there is too much pollution, warm weather, and nutrients in the water.
Mucilage is made up of tiny organisms called phytoplankton, which are like tiny plant cells that float around in the ocean. When they use too many nutrients in the water to grow, they produce mucilage as a way of protecting themselves. The mucilage forms into a slimy substance that floats on the surface of the water, like a giant booger.
Even though it may look gross, marine mucilage is actually really important because it helps clean up the ocean. It traps pollutants, like plastic and chemicals, inside its slimy substance, which helps to prevent them from harming marine life.
However, too much marine mucilage can be bad for the ocean as it can suffocate marine animals and create dead zones where there is no oxygen. That's why it's important to keep our oceans clean and healthy so we don't have too much booger-like mucilage floating around.