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        歡迎訪問華夏歷史網

        華夏歷史網_中國歷史故事_中國歷史朝代順序表_揭秘隱藏的歷史真相

        海溝是什么

        時間:2018-06-29 16:41來源:華夏歷史網 點擊:

        什么是海溝

        深度超過5000米的狹長的海底凹地。兩側坡度陡急,分布于大洋邊緣。如太平洋的菲律賓海溝、大西洋的波多黎各海溝等。

        海溝分布在哪里

        海溝多分布在大洋邊緣,而且與大陸邊緣相對平行。對于海溝的定義,科學家有許多不同的觀點。有人認為,水深超過6000米的長條形洼地都可以叫做海溝。另一些人則認為真正的海溝應該與火山弧相伴而生。世界大洋約有30條海溝,其中主要的有17條。屬于太平洋的就有14條。

        海溝是什么_海溝指什么_海溝分布在哪里

        地球上主要的海溝都分布在太平洋周圍地區,環太平洋的地震帶也都位于海溝附近。地球上最深、也是最知名的海溝是馬里亞納海溝,它位于西太平洋馬里亞納群島東南側,深度大約11,034米。1951年英國挑戰者Ⅱ號在太平洋關島附近發現了它。

        在地質學上,海溝的產生被認為是海洋板塊和大陸板塊相互作用的結果。密度較大的海洋板塊以30度上下的角度插到大陸板塊的下面,兩個板塊相互摩擦,形成長長的"V"字型凹陷地帶。另外,科學家還認識到所有的海溝都與地震有關。環太平洋的地震帶都發生在海溝附近。這是因為海溝區的重力值比正常值要低,它意味著海溝下面的巖石圈被迫在巨大的壓力作用下向下沉降。

        世界上有哪些海溝

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