Martha doesn't know if her answer is right, but she takes a risk. For 50 points she'd do anything...raising her hand she says, "The largest iceberg on record was encountered near Baffin Island in 1882. It was 13 km long, 6 km wide and had a freeboard (height above water) of about 20 m. The mass of that iceberg was in excess of 9 billion tons - enough water for everyone, in the world to drink a litre a day for over 4 years."