The Silk Roads split in order to avoid which geographic features?

The Silk Roads were split in order to avoid these geographic features: the physical and climate zones of mountain, steppe or grasslands, and river valleys and oases. The mountains, rivers, valleys, deserts, and plains made barriers for the travelers along the silk road.

The Silk Road split because of the Taklamakan Desert. This split stretch of the Silk Road is most dangerous. The two roads eventually meet again 2200 kilometers later.

Explanation:

i'm sure the answer you are looking for would be

a. an ice age

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