A large chunk of the Earth's crust is missing but scientists have now discovered where it is located.
The world is constantly throwing puzzling questions at scientists, with new technology like space imaging helping them to solve mysteries such as water “scars” left on the Earth's surface.
Another mystery that perplexed experts for over a century was known as the “The Great Unconformity” and referred to large slabs of the Earth’s crust that were missing from the geological record.