The Fertile Crescent is?

The Fertile Crescent, also known as "the cradle of civilization", is a boomerang-shaped region in the middle-east where some of the earliest human civilizations originated. The region was the birthplace of writing, the wheel, agriculture, and the use of irrigation.

Explanation:

The term Fertile Crescent was first used in a 1914 high-school textbook by James Henry an American archaeologist. The term was first used to describe a significant region of the middle-east, which contains parts of present-day Egypt, Jordan, Lebanon, Palestine, Israel, Syria, Turkey, Iran, Iraq, and Cyprus.

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the difference is that white collar worker performs skills like worker as a scientist or well blue collars do physical work and they do services like being a cook.