1. Buildings.
   Tunnels.
2. Volcanoes.
   Canyons.

There are volcanoes underwater. These volcanoes are called submarine volcanoes and after erupting, the output is vital to marine life's survival in the ocean.

1. The Indian Ocean.
   The Atlantic Ocean.
2. The Antarctic Ocean.
   The Pacific Ocean.

The largest ocean in the world is the Pacific Ocean. It is larger than all of the land on Earth and covers more than 63 million miles of area. It also touches the Americas and Australia.

1. Pacific Viper Fish.
   Giant Isopod.
2. Frilled Shark.
   Tube Worms.

The Pacific Viper Fish has teeth so large that it can't close its mouth. The Pacific Viper Fish lives hundreds of meters below the ocean's surface.

1. The Marianas Trench.
   The Blue Hole.
2. The Bermuda Triangle.
   The Southern Ocean.

The deepest part of the ocean is the Marianas Trench. The trench is over 10,000 meters deep and surprisingly, there are living creatures down in the hole.

1. The Killer Whale.
   The Beluga Whale.
2. The Narwhal.
   The Blue Whale.

The Blue Whale is the largest whale found in the ocean. They are also the largest animals in the world. The large animals can be as long as 100 feet.

1. The Pacific Ocean.
   The Atlantic Ocean.
2. The Antarctic Ocean.
   The Indian Ocean.

The Indian Ocean is the hottest ocean. The ocean has reached temperatures as high as 86 degrees Fahrenheit. In contrast, the coldest part of an ocean is called the Antarctic Bottom Water found in the Southern Ocean.

1. 100 percent.
   80 percent.
2. 7 percent.
   15 percent.

Seven percent of the ocean is covered in ice. Most of this ice is located in Antarctica and surprisingly, Greenland. These are cold areas where glaciers can typically thrive.

1. One year.
   1,000 years.
2. Five weeks.
   One day.

It takes water 1,000 years to travel around the world. The water travels in a distinct pattern throughout the world, which helps it to make its journey back and around once again.

1. 3 percent.
   76 percent.
2. 48 percent.
   90 percent.

The salt found in the ocean is 3 percent. This number doesn't sound like a lot, but it really adds up! The salt comes from the erosion of minerals by the water.

1. 100 feet.
   9 feet.
2. 400 feet.
   2,000 feet.

A diver in suit can go 2,000 feet deep into the ocean. Divers consume their oxygen very fast underwater and recreational divers usually have a limit of only 130 feet.

1. The Atlantic, Pacific and Indian Ocean.
   Only in the Atlantic Ocean.
2. Only in the Antartic Ocean.
   In the Antarctic Indian Ocean.

The Mid-Atlantic Mountain Ridge is found in the Atlantic, Pacific and Indian Oceans. The ridge was created by the movement of tectonic plates.

1. Water Hyacinth.
   Anubias.
2. Giant Kelp.
   Cape Pond Weed.

The giant kelp grows at extreme speeds. In one day, it can grow up to two feet! Giant kelp are very important to marine life as many species live in them and eat them.

1. Seaweed.
   Coral.
2. Fish.
   Crabs.

Seaweed produces much of the oxygen that we breathe. Without seaweed, much of the marine life that we know today wouldn't survive. We have these algae to thank for our oxygen and marine life.

1. 70 percent.
   10 percent.
2. 50 percent.
   5 percent.

Seventh percent of the Earth's surface is ocean. Most of the ocean has never been explored by humans due to limitations in how far we are able to travel and our technology.

1. It is naturally blue.
   The sky.
2. The air.
   The sun.

The ocean gets its color from the sun. The beams of blue from the sun are projected across the ocean, which makes it blue. This is also true for the sky.

1. The seahorse.
   The sea turtle.
2. The octopus.
   The shark.

The male seahorse gives birth. He is also the one that takes care of the young. He can give birth to up to 2,000 babies and has a very short pregnancy.

1. A Sperm Whale.
   A Killer Whale
2. A Blue Whale.
   A Beluga Whale.

Moby Dick was a sperm whale. These whales are found in the ocean and they are able to reach depths of more than 3,000 feet. They are also known to eat a lot of fish each day.

1. Sea Urchins.
   Sharks.
2. Giant Kelp.
   Jellyfish.

Jellyfish have been around for over 500 million years. They are one of the oldest organisms that has ever lived on the planet. They are even older than the dinosaurs!

1. An area of pollution under the water.
   A freezing spot under the water.
2. An area filled with organisms.
   An underwater desert.

A hypoxic area is an area of pollution under the water that can create lifeless patches throughout the ocean. Human pollution is the cause of some of these areas, but there are natural causes as well.

1. Money.
   Jewelry.
2. Electronics.
   Gold.

The ocean hides a goldmine beneath its surface. The water is filled with trillions of dollars worth of gold waiting to be mined, although it isn't an easy or effective process.

1. An eye.
   A poison spike.
2. A suction cup.
   A mouth.

Starfish have eyes on each of their limbs. This helps them to see. If they lose their arms, they also have the ability to regrow them, similar to an octopus.

1. Sand dollars.
   Coral.
2. Giant Kelp.
   Sea Weed.

Sand dollars are closely related to sea urchins. These are creatures that are truly alive, despite the fact they appear to be beautiful, patterned chunks of sand.

1. They all have webbed feet.
   They all have fur.
2. They are nocturnal.
   They contain natural anti-freeze.

In the Antarctic Ocean, animals contain a natural anti-freeze that allows them to live in the frigid waters. The anti-freeze keeps their blood from freezing up.

1. The world's oldest animal.
   The world's oldest plant.
2. The world's oldest person.
   The world's oldest city.

The world's oldest city was found under the ocean. The city is estimated to be more than 9,000 years old and it is located near India. It is under just over 100 feet of water.

1. The United States.
   England.
2. Brazil.
   Greenland/Iceland.

The largest waterfall is located underwater in between Greenland and Iceland. It is truly the largest waterfall in the world, even though it doesn't look like your typical waterfall!

1. Manganese balls.
   Angler Fish.
2. Pink sand.
   Mysterious air bubbles.

Manganese balls are found in every ocean. They vary in size and can be found in patches on the bottom of the ocean's floor.

1. Sea Urchins.
   Crabs.
2. Sharks.
   Seahorses.

Sea urchins are also known as "sea hedgehogs." They closely resemble a hedgehog with their small and spiky bodies. The little creatures may seem harmless, but they are able to sting.

1. An octopus.
   A blue whale.
2. A Great White Shark.
   A sea urchin.

An octopus has three hearts. In fact, it has multiples of many body parts, including nine brains! These eight-legged creatures can even spray ink.

1. Jellyfish.
   Dolphin.
2. Octopus.
   Sea Turtle.

Dolphins sleep with one eye open. They are extremely intelligent and use this trick to keep themselves safe from danger.

1. 100 percent.
   25 percent.
2. 50 percent.
   5 percent.

We have currently only explored about 5 percent of the ocean. The ocean is not as easy to explore as land is, but we have been making progress each year. More knowledge is being obtained each day as we explore further and further.

1. Sea Sponges
   Crab.
2. Clownfish.
   Killer Whale.

Sea sponges don't appear to be alive, but they are a living species! They have no vitals, but some of these sponges are actually able to move.

1. The sun.
   Fish.
2. Algae.
   Sand.

The color on coral comes from algae that lives on them. Coral is often thought to be a rock, but it is actually a living species. Coral feeds on fish as well as from the algae.

1. Blue.
   Brown.
2. Red.
   Purple.

Red algae would be found in warmer water. Green is another color of algae that you would likely find in warm water. These algae are commonly found on corals.

1. Titanic.
   Atlantis.
2. The Great Barrier Reef.
   Mount Everest.

The Great Barrier Reef is the world's largest living structure. It is located off the coast of Australia and it is well known for its beauty and coral.

1. A fish.
   A bacteria.
2. An underwater canyon.
   A warm patch of water.

Zhemchug is an underwater canyon found in the Bering Sea. It is both extremely large and deep, and it also can't be seen entirely from the Earth.