Explain the following:
(a) Icebergs floating in the sea are dangerous for ships.
(b) An egg sinks in freshwater but floats in a strong salt solution
(c) A toy balloon filled with hydrogen rises to the ceiling, but if filled with carbon dioxide sinks to the floor
(d) As a ship in the harbor is being unloaded, it slowly rises higher in water
(e) A balloon filled with hydrogen rises to a certain height and then stops rising further.
(f) A ship submerges more as it sails from seawater to river water