Concept map on agricultural development in the Middle Ages, with a summary and study guide for reviewing the revival of Western Europe after the year 1000. The map explains the main agricultural improvements, including the use of the heavy plow, iron horseshoes and the rigid horse collar, as well as the development of water- and wind-powered mills. It focuses on the three-field rotation system, with two fields cultivated and one left fallow, which increases harvests and creates surplus produce. The map also explains how these surpluses encourage trade and the return of the use of money, contributing to medieval economic growth.