This week on Blue Planet II we explored the open ocean; home to some of the biggest and most spectacular creatures on earth. How much do you know about the big blue?

green turtles and coral, and Chris Packham is travelling across the Baja Peninsula in Mexico tracking whales, but how much do YOU know about the wildlife featured in Blue Planet Live?

Keep reading to learn more about Earth's different layers, its atmosphere, and what makes the "blue planet" unique. Earth is made out of different layers, and those layers get hotter and more ...