What are the names of the rivers of Egypt and Mesopotamia? What natural phenomena happened to the Tigris

What are the names of the rivers of Egypt and Mesopotamia? What natural phenomena happened to the Tigris and Euphrates rivers? Why is it said that both of these rivers made it possible to engage in agriculture? What other occupations did the inhabitants of these countries have? What signs of civilization existed here? Make a conclusion.

General: in Mesopotamia, as in Egypt, the Tigris and Euphrates rivers flooded, leaving after that a fertile layer of silt in the fields. The inhabitants of these countries were engaged in agriculture and crafts. They built irrigation canals for their fields. Almost at the same time, states, cities, religious beliefs, and writing appeared.
Difference: the floods of the Tigris and Euphrates rivers passed very violently, washing away everything in their path. They built everything from clay, they wrote not in hieroglyphs, but in cuneiform, not on papyri, but on clay tablets

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