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Originally Posted by ExpErdMann
My underlying assumption is that planetary expansion can have different forms in different cases. On the Earth it appears to be associated mainly with seafloor spreading, but basalt flooding (e.g., Siberian traps) may also have played a role. On Mars it also seems to have been mostly a process analogous to seafloor spreading.
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Earth has a rift zone that is over 60,000 KM long. Neither Mars nor Venus have anything like that. So, no, Mars has nothing like sea floor spreading.
If you are saying that Earth's rift zone is due to the expansion of the Earth, then you have to explain the lack on other planets. Which you still have not done, except for hand waving at the resurfacing of Venus.
Of course, you also have to explain the subduction zones of Earth, and volcanoes on the subduction zones. Which Earth has, and which Mars lacks. The Martian volcanoes all appear to be associated with plumes, with the exception of some small ones on faults around the Hellas basin, which appear to be associated with the large impact.
On Earth, there are quite distinct types of volcanoes. The rift volcanoes all produce lava that is almost exactly 50% silica. The subduction volcanoes produce lava that is up to 75% (IIRC) silica.
Expanding planets is not an accepted theory because it does not fit with what we observe. For it to displace current accepted theories, it would have to:
1. Explain observations and measurements better than the current theories.
2. Make testable predictions. Cartoons of Earth expanding is not a testable prediction.
Way back in the previous thread I tried to get you to define a prediction that the expanding planet theory makes so we can test it. Do you have one?