Which is an example of a primary source?

speeches, manuscripts, letters, interviews, records, eyewitness accounts, autobiographies.

Original documents, so like letters, auto-biographys, speeches, intewriews, speeches.

Explanation:

folds are formed when heat and pressure is applied to the rock. the higher the temperature, the more pliable rocks become. folds are more likely to occur when the deformation caused by the compression is applied slowly. faults are defined as the displacement of rock that were once connected along a fault line.

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explanation:

the addition to geographic boundaries that might have  kept the people of the huang river civilization from traveling to far distance region is that they had learned about the other river valley civilizations but feared contact would bring invasion.

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