The major contributions of medieval china are large ships, wood blocks,marble type printer,gold,silver,spices,cinnamon,ideas of Buddhism ,and discovering coal and steel. They also traded steel,tea,porcelain,and explosives.
Geography affected the development of Chinese civilization by the terrace farming,rivers for transportation,mountains set natural borders, and they are prone to invasion with or without Great Wall.
Bibliography Title- Journey Across Time The Early Ages, author- Jackson J. Spielvogel and The National Geographic Society, publisher- The McGraw-Hill Companies