熱帶高地與沙漠
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地球的熱帶區大部分是熱帶高地,其氣候更有利於身體健康。熱帶高地隨着海拔的變化可以分爲山腳的熱帶區到山頂的白雪覆蓋區。溫帶區特別適合人類居住。在有些高海拔涼爽的高原和山谷區,人口特別密集。隨着海拔的不同,會生存不同的動植物。亞洲的季風熱帶區、沙漠河流的沿岸和高海拔的高山溫帶區都是世界上人口密集區。
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視頻年代:2003
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