Hey KamronkIng !
The reason Lascaux was closed in 1963 was because a lot of people breath and it made the paintings to corrode. Meaning to ruin the paintings. So they had to close to prevent from the paintings to be destroyed.
I hope I was able to help you out ! :D
When Pony tells her that Soda works there, she smiles and calls him a "doll." Cherry then asks Ponyboy why she never sees Soda at school. ... Ponyboy mentions that he hates calling Sodapop a dropout. The term dropout makes Ponyboy think of a "dumb-looking hoodlum" which doesn't fit Sodapop's personal.