Scientists finally finished mapping Earth's 8th continent Zealandia, helping them solve the lost continent's mysterious history

• Zealandia broke apart from the supercontinent Gondwana millions of years ago then sank.
• It's hard to study an underwater landmass, but researchers say they've created a complete map.
• Studying Zealandia's geology helps scientists understand how and why supercontinents break up.

After decades of work, a team of scientists has finally completed a map of Zealandia. It's helping them unlock the secrets of this lost continent's mysterious past.