How do mountains, deserts and waterways impact trade and where people live? Explain each and provide details and examples.

Mountains are obstacles for trade as it is difficult to build railway systems over mountains, so they must go through mountains. Deserts are also difficult to build railway systems as the conditions tend to be very harsh and dangerous for workers. Waterways could make trade easier a one could trade by boat.

Explanation:

the correct answer is the following is a list of inventions made in the medieval islamic world, especially during the "islamic golden age" (8th to 13th centuries),[1][2] as well as the late medieval period, especially in the emirate of granada and the ottoman empire.

science and technology in the islamic world adopted and preserved knowledge and technologies from contemporary and earlier civilizations, including persia, india, china, and greece-roman antiquity, while making a number of improvements and innovations.

the answer is d.index