Is this a question or statement????
The answer is the first choice.
Answer: They are known as the Hill Complex, the Valley Complex and the Great Enclosure. The Hill Complex is the oldest, and was occupied from the ninth to thirteenth centuries. The Great Enclosure was occupied from the thirteenth to fifteenth centuries, and the Valley Complex from the fourteenth to sixteenth centuries.
Explanation:
Answer: D. Geothermal
Explanation: Geo means earth thermal is heat earth heat. Boom....logic
The correct answers are dry farming, reapers, threshing machines, seed drills, and steel plows. These are the new methods and technology that revolutionized agriculture and made it practical to cultivate the plains. Thank you for posting your question. I hope this answer helped you. Let me know if you need more help.