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