The Cave of Lascaux was closed to the public in 1963 primarily due to both erosion issues and the development of colonies of algae and a calcite veil on the cave walls, which were harmful to the prehistoric artwork. Therefore, the correct answer is: Both A and B.
Why was the Cave of Lascaux closed to the public in 1963?
(2 points)
• 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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