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Re: Response II

> Incidentally, the tectonic edge of the North American Plate is NOT within
> the confines of current North America as the geographers set the boundary.
> Instead, a large section of northeastern Asia, including parts of Siberia,
> Korea, and northern Japan are (from a tectonic standpoint) part of the
> American Plate.

It doesn't extend so far south. The Sea of Okhotsk overlies a separate plate
(that broke off of the Pacific Plate some tens of Ma ago), for example; the
Bering Sea is a similar case, but its oceanic bottom is locked within the
North American Plate, while the Okhotsk plate is not, it moves.