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Earthquake - Jordskælv An earthquake is when the surface of the earth shakes. This is usually due to that the continental plates move. But it may also be because there is land uplift, it often happens in north Scandinavia because the land uplift is big there. An earthquake can be measured in many ways, but the most ordinary way to do it, which also is the most known, is the Richter scale A Richter strength on 2 - two which is the lowest, cannot really be measured, and it cannot really be felt. Whereas an earthquake with a Richter strength
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