What are primary and secondary ? How can wo foll the difference between them? 3. How primary and secondary sources to learn about the past?

Differentiate primary sources from secondary sources

Primary sources can be described as those sources that are closest to the origin of the information. ... Secondary sources often use generalizations, analysis, interpretation, and synthesis of primary sources. Examples of secondary sources include textbooks, articles, and reference books.

i think the answer is c, rivers.

explanation:

sometimes, borders fall along natural boundaries like rivers or mountain ranges. for example, the boundary between france and spain follows the crest of the pyrenees mountains. for part of its length, the boundary between the united states and mexico follows a river called the rio grande. the borders of four countries divide africa’s lake chad: niger, chad, cameroon, and nigeria.