21 Has anyone been to the bottom of Marianas Trench?

James Cameron

22 Can Marianas Trench fit Mount Everest?

No. The peak of Mt Everest would still be 2,133 meters (7,000 feet) below sea level.

23 Which ocean is the largest?

Pacific Ocean

24 What is the lowest natural point on Earth?

Challenger Deep

25 What is the highest point on earth?

Peak of Mount Everest