Final answer:
Periodical sources like website postings, online news stories, and newspaper articles published after an event are examples of secondary sources in Social Studies at the High School level.
Explanation:
Periodical sources like website postings, online news stories, journal, newspaper, and magazine articles published after an event or time are secondary sources. They provide an analysis or review of the event without offering new data, interpreting primary sources or data. For example, journal articles, literary criticism, and textbooks fall under secondary sources.
Learn more about Secondary sources here:
https://brainly.com/question/40949730
