Answer:
Long term changes last for years or generations, while short term changes may have immediate affect, they only last a short amount of time and are not good solutions for an ongoing problem.
Explanation:
Think short term quick change and long term time-consuming, long lasting change.
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Because of the vast area of China that is covered with mountains that make it hard to inhabit said areas.
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The border separates Sonora and Chihuahua is Natural boundary