What made the Fertile Crescent so fertile? A. imported crops brought by foreign traders B. moderate temperatures in the summer C. heavy snowfalls in winter D. silt deposited by annual flooding

Answer: The answer is D.

@Mnadat9 Is wrong.

This great semicircle, for lack of a name, may be called the Fertile Crescent ... Hence we are obliged to coin a term and call it the Fertile Crescent. In current usage, the Fertile Crescent includes Israel, Palestine, Iraq, Syria, Lebanon and Jordan, as well as the surrounding portions of Turkey and Iran. But the Fertile Crescent refers to areas of fertile soil near important rivers in the area. It stretches from the Nile River in Egypt to the Tigris and Euphrates rivers in modern Iraq. It also encompasses several other countries, including Israel, Lebanon, Jordan and Syria.

so A