What is the deepest known point in the ocean called?

The Mariana Trench (Challenger Deep).

Animals & Nature

Ocean Word Search

This ocean word search hides words like dolphin, octopus, seaweed to find. Play it free online or print the PDF with the answer key, a handy ocean vocabulary activity.

10 words · 11×11 grid · Medium · Answer key included · Free printable PDF

Animals & Nature

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Tap the first and last letter of a word — or use arrow keys and Enter. Dragging works too.

JELLYFISH
STARFISH
SEAHORSE
BARNACLE
STINGRAY
PLANKTON
DOLPHIN
OCTOPUS
SEAWEED
LOBSTER

🎉 Solved — all 10 words found!

True stories

Octopus garden

Monterey, California

Off the coast of Monterey, California, scientists exploring a deep undersea mountain found the largest gathering of octopuses ever seen. More than 20,000 pearl octopuses nest at the site, nicknamed the Octopus Garden, nearly two miles below the surface. The mothers cluster around cracks where warm water seeps from the rock. Researchers discovered that the heat speeds up the eggs, helping the young hatch in under two years instead of many more. After laying, each mother stops eating and guards her eggs until they hatch. The find shows how much of the deep sea remains unexplored, still full of surprises waiting in the dark.

Whale set free

Sea of Cortez, Mexico

In the Sea of Cortez, off the coast of Mexico, a small boat of whale watchers came upon a young humpback tangled in a fishing net, floating still and barely able to breathe. For more than an hour, the group worked carefully with a knife, cutting away the heavy mesh wrapped around its body and tail. Just as they freed the last of the net, the whale came alive, swimming off and then leaping from the water again and again, slapping its fins as if in thanks. The rescuers, who had nearly given up hope, watched in tears. The moment became one of the most shared whale rescues ever filmed.

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Did you know?

dolphin: Dolphins sleep with one half of the brain awake, so they keep surfacing to breathe and watch for danger.
octopus: An octopus tastes with its arms, and about two-thirds of its neurons live in those arms, not its head.
seaweed: Giant kelp is a seaweed that can grow up to two feet in a single day, among the fastest growth on Earth.
jellyfish: Jellyfish have drifted the oceans for over 500 million years, with no brain, no heart, and no bones at all.
starfish: Some starfish can rebuild a body from an arm, but the arm generally needs part of the central disc attached.
seahorse: A male seahorse carries developing babies in a pouch, then contracts his body to release the young into the water.
barnacle: Barnacles cement their heads to rocks for life and kick tiny food into their mouths with feathery legs.
stingray: A stingray is a flattened cousin of the shark, sensing the faint electric fields of prey buried in sand.
plankton: Plankton aren't all microscopic: the name describes drifting, so even a large jellyfish can belong to this wandering group.
lobster: A lobster's stomach contains a tiny grinding mill, with hard parts that crush food after the mouth swallows it.
anchor: The oldest known anchors were simply heavy stones with holes, used by sailors more than 4,000 years ago.
turtle: Sea turtles return to the very beach where they hatched to lay eggs, steering by Earth's magnetic field.
shark: Sharks are older than trees, having swum the seas for over 400 million years through five mass extinctions.
whale: A diving blue whale's heart has been recorded beating twice a minute, leaving an astonishingly long pause between this enormous animal's beats.
coral: Coral looks like a plant but is really a colony of tiny animals, cousins of jellyfish and sea anemones.

Trivia

About what fraction of Earth's surface does the ocean cover: one quarter, one half, or seven-tenths?
Seven-tenths (about 71%).
What is the largest ocean on Earth?
The Pacific Ocean.
Roughly how much of the world's oxygen is produced by ocean plankton: one tenth, one half, or all of it?
About half.
What is the deepest known point in the ocean called?
The Mariana Trench (Challenger Deep).
Which sea creature has three hearts and blue blood?
The octopus.

Trivia · 1 / 5

About what fraction of Earth's surface does the ocean cover: one quarter, one half, or seven-tenths?

Seven-tenths (about 71%).

In their words

The sea, once it casts its spell, holds one in its net of wonder forever.
Jacques Cousteau

The edge of the sea is a strange and beautiful place.
Rachel Carson

Is this ocean word search free to print?

This ocean word search is a free printable puzzle with 10 hidden words in an 11×11 grid. Find words like JELLYFISH, STARFISH, SEAHORSE hidden across, down, and diagonally. You can play it right here in your browser — tap the first and last letter of a word — or download it as a printable PDF with the full answer key on page two. It's free for personal and classroom use, so teachers can print copies for a whole class with no sign-up and no account. Word searches like this one are a proven way to build vocabulary, spelling, and word-shape recognition, which is why they're a favourite with ESL learners, elementary classrooms, and anyone who likes a quiet puzzle with their coffee.

Print this Ocean word search