Eygypts black land was caused by

According to www.historymuseum.ca, "In ancient times, the Egyptians called the desert the "red land", distinguishing it from the flood plain around the Nile River, called the "black land". These colors reflect the fact that the desert sands have a reddish hue and the land around the Nile turned black when the annual flood waters receded."

Explanation:

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the old way of life was represented by superstition, an angry god, and absolute submission to authority. the thinkers of the age of reason ushered in a new way of thinking. this new way championed the accomplishments of humankind. individuals did not have to accept despair. science and reason could bring happiness and progress. kings did not rule by divine right. they had an obligation to their subjects. europeans pondered the implications for nearly a century. americans put them into practice first.