The two different sources in the study of history are primary and secondary sources.
Primary sources are those that come from those that have experienced or witnessed the history themselves. These include their diaries, speeches, personal statements, etc. If one were studying Einstein, for example, these would be his own statements, letters to his children, published papers, etc.
Secondary sources are those that come from others who have compiled and analyzed historical events. These include the writings of other historians, journalists and often family members or friends of an historical person or people tangentially related to an historic event. In the Einstein example, these would be the comments of his biographers, newspaper articles about him, the comments and writings of his friends and family, etc.
The two different sources are primary and secondary sources
Change and continuity.
What are two ways that's scientists can study earths climates history
History is the study of the past.
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One way that scientists can study earth's climate history is by seeing where places and things are eroded.
In general sources in history are divided in two primary and secondary. They are important because they teach a child about how was documents written during the time and after that. Also sources hepl history telling how wars were developed.
Two different types of energy are wind,and water.