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| ▲ | tbrownaw 2 days ago | parent [-] | | Everything except geothermal and fission. Unless you count where the fissionable elements came from, in which case you're only left with the portion of geothermal that's from gravity (residual heat from the earth compacting itself into a planet). | | |
| ▲ | Jensson 2 days ago | parent | next [-] | | Tidal waves comes from earths rotation, so not fusion nor fission. | | |
| ▲ | markburns 2 days ago | parent [-] | | what set off the spinning? | | |
| ▲ | gattr 2 days ago | parent [-] | | Earth's spin comes from the parent molecular cloud which formed the Solar System (including any impacts during the protoplanetary phase.) And that ultimately from density fluctuations after Big Bang, and the way they led to coalescence of galaxies and galaxy clusters. |
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| ▲ | gattr 2 days ago | parent | prev [-] | | To be nitpicky, our uranium and thorium were made via r-process (rapid neutron capture), which is not the kind of fusion occurring in the Sun at present. [1] https://en.wikipedia.org/wiki/R-process |
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