11°21′N 142°12′E / 11.350°N 142.200°E / 11.350; 142.200
馬里亞納海溝(粵拼:maa5 lei5 ngaa3 nap6 hoi2 kau1)(粵 : 瑪利安納海溝) 係太平洋嘅馬里亞納群島附近嘅一個海溝。呢個海溝係地球入面最深嘅海溝,亦同時係太平洋板塊同歐亞板塊之間嘅緩衝帶。佢東西有約2550公里長,南北約69公里闊。
馬里亞納海溝唔單止係世界上最深嘅海溝,甚至係地殼表面最薄嘅地區同埋地球壓強最大嘅地區。佢最深嗰度係海平面以下10,994(±40)米,而最深嘅位就喺海溝嘅最西南邊嗰度。如估將一座珠穆朗瑪峰同金剛山放入去海溝嘅最深嗰度,連山頂都出唔到海平面。喺海底嗰度,平均水溫凈係得1——4℃到.
一講馬里亞納海溝嘅最深嗰度,如估喺壓強嚟講,水壓起碼去到108.6MPa、即係有差唔多1400米嘅鐵柱對自己嘅壓強咁大。同標準嘅大氣壓嚟講,幾乎差咗成1000倍咁多。
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