One reason: Plowing large areas of land
A few more reasons: poor farming practices, farmers would loosen up the soil, and the land was deforested, making it loose the roots that held the soil in place.
Answer:
But the foundations of modern science were laid long before this time, and were particularly influenced by Islamic civilization. The Muslims were the leading scholars between the seventh and fifteenth centuries, and were the heirs of the scientific traditions of Greece, India and Persia.
Hope this picture with a fact helps you.
Mao Zedong was born on December 26, 1893
I believe the correct answer is Manchu quin dynasty