Why Do Oceans Sometimes Turn Green?

Sometimes, the ocean looks green because tiny plants called algae grow a lot. It's like when you put too many fish in a bowl, they get crowded and start to change the color of the water. These algae can make the ocean look bright green, especially on sunny days.

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Examples

When there's a lot of food in the water, tiny green plants grow really fast, turning the ocean bright green like a painted canvas.
On a sunny day, you might see the whole beach surrounded by a sea that looks like it's been dyed with paint.
Sometimes, people can't go swimming because the water is so green and feels thick, like soup.

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Categories: Environment · ocean,algal blooms,water pollution