KEYWORDS are words you come up with on your own, using the main concepts of your research question. Create synonyms of these concepts to create more. For example for "shrimp farm," you might also try "aquaculture" or "shellfish farm." Other examples:
- drought AND "Southern California"
- "sea level" OR "global warming" AND "coral" OR "sea life"
- ocean and "global warming"
- Hawaii AND "sea level"
SUBJECT HEADINGS are vocabulary a librarian assigns to different records in the catalog. You can find subject headings by finding an article that is relevant and looking at the subject headings that have been assigned to it. Use one or more to search via a keyword or subject heading search.