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Since scientists first began mapping the Earth's global gravity fields back in the 1960s, it has become clear that parts of Canada are "missing" gravity. What this really means is that certain areas of the country - especially in and around the Hudson Bay area - have less gravitational pull than across the rest of the world. But why is the Hudson Bay region particularly affected by low mass - and, as a result, low gravity? There are two main theories to the conundrum, both of which are believed to partly explain Canada's missing gravity. [Source: Envirotech Online]
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