Final answer:
The Gobi desert made trade difficult with lands north of China due to its extreme climate and harsh conditions.
Step-by-step explanation:
The Gobi desert made trade difficult with lands north of China. It is a large arid desert that stretches across northern China and southern Mongolia. Due to the extreme climate and harsh conditions in the Gobi desert, it created a formidable barrier for trade and limited access to the lands north of China.
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