Question

how do icebergs form?
○ they form when seawater freezes.
○ they form when groundwater freezes.
○ they break off from the coast of iceland.
○ they break off large ice sheets found at the poles.

Explanation:

Icebergs are large chunks of freshwater ice that originate from the massive ice sheets covering polar regions (like Antarctica and Greenland). When these ice sheets extend into the ocean, pieces calve (break off) to form icebergs. Seawater freezes to form sea ice, not icebergs; groundwater freezing forms permafrost or ice features on land, not icebergs; and icebergs form in multiple polar/near-polar regions, not just Iceland's coast.

Answer:

D. They break off large ice sheets found at the poles.