The ocean can turn green because tiny plants called phytoplankton bloom like a giant underwater garden.
Imagine you're playing in a big puddle with your friends, and suddenly everyone starts splashing water everywhere, the puddle gets muddy and changes color. That’s kind of what happens when there are lots of phytoplankton in the ocean.
What Are Phytoplankton?
Phytoplankton are like tiny green algae that float on the surface of the ocean. They’re so small, you can’t see them with your naked eye, but when they multiply quickly, they make the water look green, just like how a grass field looks in spring.
Why Do They Bloom?
Phytoplankton need sunlight and nutrients to grow, just like you need food and water. When there’s lots of sunlight and nutrients from the bottom of the ocean, maybe because of waves or currents, they multiply quickly, turning the ocean green.
It's like when you plant seeds in a garden and get lots of rain, suddenly, your garden is full of flowers!
Examples
- A child notices the water looks green while swimming near the shore.
- A family on vacation sees a whole section of the ocean turn bright green.
- A person taking a walk by the beach is surprised to see the sea appear green.
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See also
- What Makes a ‘Coral Reef’ Different from a ‘Fish Tank’?
- How Does the Moon Affect the Oceans?
- What Makes the Ocean So Salty?
- Why Do Jellyfish Sting?
- Why Do Jellyfish Glow in the Dark?
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