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If you’re reading this in Scandinavia or in the Hudson Bay area of Canada, you’re going up in the world. And if you’re anywhere in the northern US, you’re going down – quite literally. The Earth’s surface in these places is rising or sinking by several millimetres a year, even though they are quite some way from major tectonic plate boundaries. Compared with the Himalayas, which are pushing up by more than a centimetre a year, this may not seem like much, but we’re talking here about entire countries or regions. And it may surprise their inhabitants that these movements are thought to be a major cause of earthquakes.…