What fraction of the volume of an iceberg (density 917

kg/m3) would be visible if the iceberg floats (a) in the ocean

(salt water, density 1024 kg/m3) and (b) in a river (fresh water,

density 1000 kg/m3)? (When salt water freezes to form ice, the

salt is excluded. So, an iceberg could provide fresh water to a

community.)