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地理学上的大陆架是指邻接和围绕大陆领土、坡度平缓的浅海地带。它是陆地的自然延伸并被海水覆盖的部分。它从低潮线起逐渐向外倾斜,平均坡度小于1°,一般深度约200米。从这里再向外倾斜,坡度变得相当陡峭,平均约3—6°,急剧向下,直到坡度明显增大,深达3000米左右的地点为止。这个坡度急转直下的海底区域,称为大陆坡。在大陆坡的底部铺盖着大量沉积物,通常称为大陆基,坡度约1°左右,深达4000—5000米。由此往下便是海
The geographically continental shelf refers to the gently sloping shallow sea that borders on and surrounds the mainland. It is a natural stretch of land and covered by sea water. It gradually slopes outward from the low tide line with an average gradient of less than 1 ° and a general depth of about 200 meters. From here and then tilt outward, the slope becomes quite steep, with an average of about 3-6 °, down sharply until the gradient significantly increased up to 3000 meters deep so far. This steep slope down the seabed area, known as the continental slope. The bottom of the slope is covered with a large sediment, commonly known as the continental base, with a slope of about 1 ° and a depth of 4000-5000 meters. From here is the sea