What is a blue hole?
Which is the world’s largest ocean basin?
UK mains electricity has 230 Volts. What is the highest voltage electric eels produce?
How much of the ocean floor has been mapped?
How deep is the deepest point in the sea?
What can turtles mistake plastic bags for in the ocean?
Which ocean is bound by the North American, European and Asian continents?
Where is the world’s largest coral reef?
How much does an adult blue whale weigh?
What are gabions?