1 : Third largest city. A port city and manufacturing center
-Guangzhou
2 : The cultural center of China; 2008 Olympics were held here.
- Beijing
3 : Capitalist economy, operating somewhat independently from China.
-Hong Kong
4 : The largest city. Major economic and financial center. Terrible pollution.
-Shanghai
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Oceans if wrong I’m sorry
Answer:
I think it's formation of a tectonic plate