Plate tectonics-May 21 2015
Well how do we know if the earths surface has moved,well first if it's a big one there will be a earthquake and may have moved the ground also if the geology is different also if we see it by having a rope a riding through a ocean and sea how far if it's farther/closer now.
When the tectonics plates together than there would be a earthquake most likely there would be a earthquake and we would see the earth shake same with tectonic plates moving apart than there would be magma and would cool of with lots of cranks and when it slides also they would be lots of cranks and jumbles of rocks.
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