Ocean Quiz

The world’s ocean is often divided into how many individual oceans?

• 4

• 6

• 5

Answer explanation

There is one world ocean, but it is divided into five main oceans.

1. What is the largest and deepest ocean on Earth?

• Pacific

• Atlantic

• India

Answer explanation

The Pacific Ocean is the largest and deepest of the world's ocean basins

What ocean region is the coldest and smallest?

• Arctic

• Pacific

• Indian

Answer explanation

The Arctic Ocean is the coldest ocean, even colder than the waters surrounding Antarctica. Since the Arctic Ocean always has sea ice even during summer.

The Arctic Ocean is the smallest of the world's five ocean basins.

Which ocean is called a peaceful ocean?

• India

• Arctic

• Pacific

Answer explanation

Magellan called this body of water pacific, due to the calmness of the water at the time ('pacific' means peaceful).

Can you name the deepest known point in the Pacific?

• The South Sandwich Trench

• The Mariana Trench

• The Kermadec Trench

Answer explanation

The Mariana Trench, in the Pacific Ocean, is the deepest location on Earth.

Which sea is the saltiest in the world?

• Black sea

• Red sea

• Ross sea

Answer explanation

The saltiest sea in the world is the Red Sea with 41 parts of salt per 1,000 parts of water.

Where does most ocean pollution come from?

• Marine activities

• Land activities

• Both, it is fairly evenly divied

Answer explanation

More than 80% of all ocean pollution comes from land.

How much of the Earth’s surface is covered by ocean?

• 51%

• 71%

• 81%

Answer explanation

We live on a blue planet, with oceans and seas covering 71% of the Earth’s surface.

Humans have mapped more of Mars than they have of the Earth’s oceans.

• True

• False

Answer explanation

We have explored less than 5% of the planet's oceans.The map on Mars is more detailed than the map of the oceans on Earth.

According to scientists, what is one of the biggest threats to our oceans?

• Sharks

• Volcanic eruptions

• Plastic pollution

Answer explanation

Plastic pollution is a major problem, with about eight million metric tons of plastic waste entering the oceans every years. You can help by using less plastic and recycling whenever you can!