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