1. Geology
The colliding fragments mentioned earlier have been credited for being one of the sources of Earth's internal energy. ... These fragment impacts are one of many major internal energy sources of the Earth. ... Besides extraterrestrial impacts and the gravitational compaction, Radioactive decay is furthermore another source of internal energy. ... As we discussed earlier these heat sources were a result of various energy processes. ... This shifting of the lithosphere's plates is the source of most tectonic activity. ...
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