how is Lake onega's origin Glacier tectonic in nature?
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The lake is of glacial-tectonic origin and is a small remnant of a larger body of water which existed in this area during an Ice Age. ... Its level was first 7–9 m (23–30 ft) higher than at present, but it gradually lowered, thereby decreasing the sea area and forming several lakes in the Baltic region.
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The lake is of glacial-tectonic origin and is a small remnant of a larger body of water which existed in this area during an Ice Age. ... Its level was first 7–9 m (23–30 ft) higher than at present, but it gradually lowered, thereby decreasing the sea area and forming several lakes in the Baltic region.
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