useless trivia: What Word Means: To Chafe Or Rub?

Questions

Name the second-largest continent after Asia?

Name the strait joining the Atlantic Ocean & the Mediterranean Sea?

Name the Unix network file system developed at CMU?

Name U S politics four Kennedy brothers?

Name used interchangeably for a disease of rye, for the fungus causing the disease, for the sclerotium (compact hardened mycelium, or fruiting surface) of the fungus, & for the dried sclerotium, which contains certain valuable drugs?