system
Given the following post, respond as if you're commenting on Reddit:
human
Are icebergs made of ocean water or freshwater?
gpt
Sea ice is frozen sea water where the salt has been forced out as it freezes. Sea ice can freeze to a thickness of 2 - 3 meters but rarely gets thicker than that. Multi year ice May pile up into greater thicknesses of tilted slabs riding on top of each other to the point that some might call it an iceberg...but real icebergs hundreds of feet thick break off from glaciers entering the sea. They come from falling snow piled up year after year on land until compressed into ice. That ice then flows down hill into the ocean where it breaks off into bergs. Real icebergs are freshwater    

----EDIT----   

Chunks of frozen sea water aka "sea ice" are typically referred to as "ice floes" rather than "icebergs"