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Rothiemurchus
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When the forest was flattened in Tunguska witnesses said the ground shook at widely spaced intervals.Was this because of repeated impacts from space or because a shock wave inside the Earth was bouncing around in the mantle.Did some impact debris stay inside the Earth? Does the fact that the impact happened in the north suggest that the Earth's magnetic field guided an object that could respond to magnetism? Has a similar impact happened in the south around or on Antarctica in the past?