Where is the world’s largest coral reef?

• Australia.
• Florida.
• Red Sea.
• Hawaii.

What are gabions?

• Curved sea walls to reflect wave energy back into the sea.
• Wooden structures built at right angles to a beach.
• Metal mesh cages containing rocks.
• Types of grass planted in sand dunes to hold them together.

Which is the world’s largest ocean basin?

• Pacific Ocean. 
• Indian Ocean.
• Arctic Ocean. 
• Atlantic Ocean.

Which ocean is bound by the North American, European and Asian continents?

• Indian Ocean.
• Arctic Ocean.
• Atlantic Ocean.
• Pacific Ocean.

How much does an adult blue whale weigh?

• About the same as 100 elephants.
• About the same as 40 elephants.
• About the same as 20 elephants.
• About the same as 5 elephants.

How deep is the deepest point in the sea?

• 5,700 metres below sea level.
• 7,300 metres below sea level.
• 11,000 metres below sea level.
• 8,400 metres below sea level.

What is a blue hole?

• A blue whale’s mouth.
• A missing electron in an atom.
• A deep but narrow sinkhole on the floor of the ocean.
• A point of intense gravity in space which light cannot escape from.

What can turtles mistake plastic bags for in the ocean?

• Younger turtles.
• Jellyfish.
• Squid.
• Seaweed.

How much of the ocean floor has been mapped?

• 6%
• 27%
• 19%
• 54%

UK mains electricity has 230 Volts. What is the highest voltage electric eels produce?

• 860 volts. 
• 420 volts.
• 572 volts. 
• 1190 volts.