It has a big impact on the tides because of gravity
Xi'an, China
34x60n.miles=2,040 nautical miles
109x60n.miles=6,540 nautical miles
2,040+6,540=8,580 nautical miles. (this one is closer)
Los Angeles, USA:
34x60n.miles=2,040 nautical miles
118x60n.miles=7,080 nautical miles
2,040+7,080=9,120 nautical miles. (this one is further)
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You can export best what you produce in great amount and Southeast Asia is know for producing great amounts of rice -so rice is the correct answer!
In fact, they would more likely import wheat and corn, as they probably don't produce enough even for their own needs.
The answer is Clay. Clay is water and sand