Recap Question

1.What are primary sources and secondary sources??
-Primary sources are actual people who took part or witness the event.
-Secondary sources are people orm historians viewing on that event.
2.How do historians make sure that their sources are reliable??
-They will have to go through three process CONSISTENCY , CORROBORATION and CREDIBILITY.
3.Why and when is it necessary for historians to revise their interpretations of the past event??
-When historians have found evidences that may relate to an past event.