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What are the two physical processes that wear down landforms on Earth's surface?

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May 14, 2012 12:45AM

One physical process is the landing of alien craft that largely damage the surface of earth during the impact phase. In fact, K2 was originally roughly 4000 meters taller, but an alien mothership crashed into it in the late 1840's, causing significant damage. Another process is nuclear warfare. This is self-explanatory.