Question

The caves at Lascaux were closed in 1963 because

Answer 1

The caves at Lascaux were closed in 1963 because the weather was destroying the paintings. The weather was ruining what had been preserved.

Answer: The weather was destroying the paintings

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Answer 2

By 1955, carbon dioxide, heat, humidity, and other contaminants produced by 1,200 visitors per day had visibly damaged the paintings. ... Consequently the cave was closed to the public in 1963, the paintings were restored to their original state and a monitoring system on a daily basis was introduced