Both A and B.
The Cave of Lascaux was closed to the public in 1963 because the floor of the cave was becoming eroded, which posed a risk to the integrity of the artwork. Additionally, colonies of algae and a calcite veil were developing on the cave walls, further threatening the preservation of the ancient artwork.
Why was the Cave of Lascaux closed to the public in 1963?
The floor of the cave was becoming eroded.
Colonies of algae and a calcite veil were developing on the cave walls.
visitors were inadvertently smudging artwork.
Both A and B.
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