热带高地与沙漠
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地球的热带区大部分是热带高地,其气候更有利于身体健康。热带高地随着海拔的变化可以分为山脚的热带区到山顶的白雪覆盖区。温带区特别适合人类居住。在有些高海拔凉爽的高原和山谷区,人口特别密集。随着海拔的不同,会生存不同的动植物。亚洲的季风热带区、沙漠河流的沿岸和高海拔的高山温带区都是世界上人口密集区。
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視頻年代:2003
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