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 form when large chunks of ice break off (calve) from ice sheets. Ice sheets are found at the poles (Antarctic and Greenland). Seawater freezing forms sea - ice (not icebergs). Groundwater freezing is not relevant. Iceland's coast is not the main source of icebergs (Antarctic and Greenland ice sheets are).

Answer:

They break off large ice sheets found at the poles.