One unique achievement of the Incan civilization was the use of what agricultural technique?

The Incan civilization is renowned for its innovative agricultural techniques, with terrace farming being one of its most significant achievements. Terrace farming involves creating stepped levels on the sides of mountains or hills, which allows for the cultivation of crops in environments that would otherwise be too steep or difficult for traditional farming. This method was particularly effective in the Andes mountains, where the Incas faced challenging topographical conditions.

The terraces helped in maximizing arable land and played a crucial role in the management of water and soil erosion, enabling better moisture retention and drainage. This method also facilitated the growth of a variety of crops, contributing to food security and the overall stability of Incan society. The terraces were often lined with stones and soil that improved the agricultural yield, reflecting the Incas' sophisticated understanding of their environment.

Other agricultural techniques mentioned, such as irrigation systems, crop rotation, and hydroponics, were used in various cultures but did not represent the unique achievements of the Incas in the same way as terrace farming. The Incas are particularly celebrated for their mastery of terrace farming, which allowed them to thrive in a diverse and difficult landscape.