Quite often on the beach here, we get piles of brownish sea foam. More so than I’ve generally seen on other beaches. You especially see this on days when it is stormy or windy and the sea is churning.
I’ve always wondered what caused it and today, I randomly happened upon the answer: it comes from organic matter that is floating in the sea. When the sea gets particularly churned up, the organic matter forms the foam.
This makes sense since I know the water here is chock full of organic matter that is washing out of the inland rivers and marshes. Even on a good day, the water here is very cloudly and you can always see bits of stuff floating in the water.