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There is a new kind of algae, or seaweed, called rock snot that is causing problems. Rock snot is growing out of control in some parts of the US. The slimy stuff doesn’t harm people. But it can form a huge mat on the bottom of a lake or river. That can destroy the plants that fish eat.
What is There is a new kind of algae, or seaweed, called rock snot that is causing problems.