Europe i hope i helped i had that test <span />
A river valley civilization is an agricultural nation or civilization situated beside and drawing sustenance from a river. A "civilization" means a society with large permanent settlements featuring urban development, social satisfaction, specialization of labor, centralized organization, and written or other formal means of communication. A river gives the inhabitants a reliable source of water for drinking and agriculture. Additional benefits include fishing, fertile soil due to annual flooding, and ease of transportation. The first great civilizations, such as those in Mesopotamia and Ancient Egypt, all grew up in river valleys. Tigris River flourished near Mesopotamia civilization and river nile flourished near civilization of Egypt.
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Turbidity. As your book/question states it is a measurement of cloudiness in water.
<span>The correct answers are 1)C The medieval era was the age of feudalism, a system that was already declining after the Black Death, but was rapidly being removed after this War (leading to the supremacy of royalty and more "democratic" tendencies); 2)A The Medieval Age was focused on the Church's/Pope's huge and unquestioned influence (on par with the kings' power at the time); answers b. and. c. are almost senseless regarding the quesiton itself, D. led the way to Protestantism and other religious branches, but it was the self-awareness that people acquired, that mainly led to the end of Medieval Era.</span>