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Can someone tell me what this line/ridge is in the Atlantic Ocean off the eastern seaboard ?

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4 Answers

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  • 2 months ago

    Are you talking about the New England seamounts?  The later stages of the Montérégie intrusives and the volcanics of New Hampshire like the Ossipee Complex?

    There was a deep source of magmatic activity in the mantle,and while the mantle source did not move, the overlying North American plate moved westward (from the opening of the Atlantic). Similar in idea to the Hawaii volcanoes.  The intruisions get younger and younger, the further east you go.  The oldest are near Montreal (and in fact, Montreal is named for the "mountain" created by one of them).

  • Anonymous
    2 months ago

    If you mean the line between the lighter blue and the darker blue, that is called the "continental shelf". 

    A continental shelf is a portion of a continent that is submerged under an area of relatively shallow water known as a shelf sea. Much of these shelves were exposed by drops in sea level during glacial periods.

  • 2 months ago

    That's the continental shelf. It is no a ridge in the geologic sense. It's where the more silicic granitic crust  of the continent ends and the basaltic oceanic crust begins. 

    https://en.m.wikipedia.org/wiki/Continental_shelf....

    Saying the pictures are inconsistent is ridiculous. Continental shelves are very long. 

  • 2 months ago

    It's probably supposed to be the "continental shelf" although if you Google the Atlantic continental shelf you'll see various inconsistent pictures.  Anyway, so the area to the left of the line is shallower than the area to the right of the line, and the line is drawn in the vicinity of a steep drop-off.

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