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Anything is possible until it's confirmed it's not(such as Earth being flat/center of Universe).
Modern science has only been around for ~200 years, not nearly long enough to discredit any plausible theories for the Solar System, which includes Expando Planet theory.
Why such large volcanoes?
The answer to that question is that nobody really knows why the volcanoes on Mars have grown to such extreme proportions and a number of theories have been put forward to attempt to explain it. Probably the most likely reason is that Mars has no plate tectonics, so the surface of the planet does not move over the mantle below, therefore hot spots which cause such volcanoes as these, are allowed to remain under one area for a very long time, so the volcanoes keep growing.
The first evidence for plate movement was, of course, found by Wegener in 1925. This was a result of a comparison of the continental edges of South America and South Africa.
The evidence has been presented several times on the thread, you just choose to ignore it.
The slow-expanding Earth theory of Creer (1965) and others is more plausible but lacks evidence. It does not suggest why the Earth would expand, why continental drift began so late in the Earth's history or where the energy source for expansion is derived from.
The weakness of the theory is how did the planet gain so much mass to expand. The weakness of the other theories is what happens to the plates that are pushed under the moving continental plates.
I think another possibility is that in the past we might have gone through clouds in space, during which time the Earth would have gained a far greater level of mass than at present, and this would also explain the ice ages. [/.quote]
We can look to the Moon and see that there is hardly any material on the surface. There is only a few cms of material that has accumulated in billions of years.
Notice the keep growing bit !
Pangaea theory omits this. Pangaea theory also redraws and does a bunch of funny editing to make it work. ITs flawed but we should be thankful of the Pangaea theory and its failure. It became a needed stepping stone to the expanding earth theory.
As you can see Pangaea theory always ignores the fact that the North and south American coasts also contact Eurasia and Australia not to mention Antarctica new Zealand Hawaii..... but on a much smaller earth.
If one would have the perfect answer to that it would defeat the meaning of the word theory.
Dont worry, people are working on it. Many geologists that I know subscribe to it. Pangaea is a theory, a failing one and a new model is taking its place, who would of thunk that humans can evolve?
Today, the ideas of sea-floor spreading and subduction explain clearly why so many of the world’s volcanoes are situated on the Pacific island arcs, the Ring of Fire, where earth’s tectonic plates are being subducted beneath deep ocean trenches.