Mercator's field: Abbr.

• Elem. sch. class
• Popular Sporcle subj.
• Michael Jordan's major at UNC: Abbr
• Sci. with maps
• High school subject, briefly
• An earth sci.
• Atlas maker's subj.
• An earth sci

Wiktionary Word definitions in Wiktionary
n. (context UK English) geography, mainly used by schoolchildren.