Depreciation, defined as loss of value from any cause, is generally divided into three classes. the loss of value due to wear and tear and action of the elements is called:

This is called Physical deterioration.

Explanation:

Physical Deterioration is the loss in value from all causes of age and action of elements.  It is caused by number of sources wear and tear , disintegration and decay.

the historians cited in the article all agree with one another about the cause of the civil war. despite coming from different backgrounds and cultures, the historians agree that slavery was the root cause of the civil war. the fact that all these historiansgenerally agree with one another makes their shared viewpoints more reliable and valid, especially because the historians have different backgrounds and all work for the well-respected institutions of howard university, clemson university, and the university of colorado.