Which geographic factors contributed to the decline of Sumer? Choose all answers that are correct. A. Irrigation of the crops le
d to salinization of the soil. B. Sumer was located on a flat plain that provided no natural barriers to invasion. C. Mountains made agriculture difficult. D. The land became too swampy to grow adequate crops.
It's A Irrigation was overused, the soil didn't get any rest (crop rotation is a younger invention), the result was salinization of the soil, which led to decline of Sumer.
Thomas Paine is an author he wrote the book "Common Sense" back in the 1700 when we were at war with Great Britten. He was also a founding father of the United States
