Test your ocean knowledge!

How much of Earth's surface do oceans cover?

• 1/3

• 2/3

• Half

How much of Earth's water is in the ocean?

• 70%

• 80%

• 90%

• 50%

How much of the ocean's water is fresh water (not salt)?

• 10%

• 30%

• 50%

• 5%

The deepest spot in the ocean is the Mariana Trench

• True

• False

Which is the largest ocean on earth?

• Pacific

• Atlantic

• Indian

• Arctic

What is the biggest animal in the sea?

• Shark

• Dolphin

• Whale

• Octopus

Most oxygen on earth is created by:

• Trees

• Oceans

• Humans

How do fish breathe underwater?

• They come up for air

• They breathe less than humans

• They don't need to

• They have gills

How many oceans are there in total?

• 4

• 7

• 5

• 3