Icebergs are harmful and pose a threat to ships who are checking out climates for the global warming faze and icebergs may help them but they are causing sea levels to rise and cities needing to be evaluated so they can sink ships such as the titanic where 1500 people died. So over all icebergs are bad they are a danger to the human race.

Iceberg

 Snow falls and turns into crystals 

from more snow compacting it

 forming into ice in the arctic

Iceberg floats around for three to six years

Melts into warm water and

 becomes the ocean and freezes 

when it reaches Antarctica

Floats into warm water

And starts to melt