and giant - more than 10 km.

Drift ice affects:
* Security of navigation
* Climatic impact (see Polar ice packs)
* Geological impact
* Biosphere influence (see Ecology of sea ice)

Drift ice can exert tremendous forces when rammed against structures, and can shear off rudders and propellers from ships and strong structures anchored to the shore, such as piers. These structures must be retractable

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