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The speaker is talking about the water. During winter, the water enters the cracks and freezes and expands. It breaks the stone and makes cracks and when the water melts the holes are bigger. What he is describing is mechanical weathering which is common in nature.
Answer:
Many scientists believe that the roofs of these houses were made from whale ribs and the bones of other animals. the region did not have enough food for them during the colder seasons.
Explanation:
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