A Georgia high school teacher is facing multiple charges after she allegedly had sex with a student on campus, authorities say. Maris Nichols, 25, a biology teacher at Alexander High School in Douglas County, was arrested Friday and charged with two counts of sexual assault by a person with supervisory or disciplinary authority, according to the Douglas County Sheriff’s Office. Investigators say Nichols had sexual intercourse with the same student on at least two separate occasions, according to arrest warrants obtained by 11Alive . The first encounter allegedly happened on April 23 in a closet between classrooms at Alexander High School. The second allegedly took place on May 2 inside a Hummer parked in a driveway in Douglasville.…