Irrigation of crops led to salinization of the soil, Sumer was located on a flat plain that provided no natural barriers to invasion, and the land became too swampy to grow adequate crops.
I am not totally sure about this one but I believe it would be p<span>rops used in the Renaissance period were much more elaborate than those used by the Greeks and Romans.
The renaissance was, in many ways, more advanced than Greece and Rome because </span>the Renaissance was more of a continuation of the discoveries and ways of life that had existed during the Greek and Roman times. As such, it would make sense that the Renaissance had more complex theatre props. Also theatre was flourishing during the Renaissance so better props would have been made.
The technique which two protesters of the Sardar Sarovar Dam project use to gain attention tot heir protests is: <span>a hunger strike/fasting
They began their fast to protest the central government that stands with the Sarovar dam project that endangers civilian's farm lands by increasing the height of the dam.</span>
