| 21. | To what degree do areas in the pack ice vary from year to year?
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| 22. | Zones of compression also arise, where the ice piles up to form pack ice.
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| 23. | In summer they live along the edges of the pack ice near the island.
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| 24. | The Antarctic summer causes the pack ice to break up.
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| 25. | It is most widespread throughout the polynyas and pack ice of the Bering Sea.
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| 26. | At the time, Nome was separated from open water by a pack ice field.
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| 27. | The same night the pack ice prevented the ships from continuing to the south.
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| 28. | Pack ice soon formed, which reflected the sun's rays, chilling the region still further.
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| 29. | This variability results in the collision and crushing of fresh, old, and pack ice.
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| 30. | Or take a cooler with you to the store and pack ice cream in that.
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