Of the four river valleys that supported major early civilizations, which one lost one of it's major rivers?

A. Yellow River
B. Mesopotamia
C. Egypt
D. Indus Valley

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To determine which of the four river valleys lost one of its major rivers, we can examine the characteristics of each river valley.

A. Yellow River: The Yellow River, also known as the Huang He, is located in China. It is known for its frequent flooding and the fertile soil it brings, which enabled early civilizations to develop in this region. The Yellow River did not lose one of its major rivers.

B. Mesopotamia: Mesopotamia, located in modern-day Iraq, lies between the Tigris and Euphrates rivers. These two rivers played a crucial role in the development of early civilizations, providing water for agriculture and transportation. Mesopotamia did not lose one of its major rivers.

C. Egypt: The Nile River is the major river in Egypt and is considered the lifeblood of this civilization. The Nile River has two main tributaries, the White Nile and the Blue Nile, which converge in Sudan and flow northward into Egypt. Egypt did not lose one of its major rivers.

D. Indus Valley: The Indus Valley Civilization, located in present-day Pakistan and northwest India, thrived around the Indus River. This river, also known as the Sindhu, was vital for agricultural activities and trade. However, it is worth noting that over time, the course of the Indus River has shifted, which had significant impacts on the settlements in the Indus Valley. Therefore, the Indus Valley lost one of its major rivers.

In conclusion, the answer is D. Indus Valley