The crust of the Earth does shift and move around; it is called plate tetonics, first introduced as continental drift years ago. By comparing the shape of South America and Africa, a scientist noticed that they fit together like pieces of a jigsaw pauzzle. There are huge plates that float around on molten rock. The shifting of these plates can cause earthquakes. The San Andreas Fault in California, USA is a famous one. This, however, is a good thing. If the interior of the Earth were not still molten, it would not be able to produce the magnetic field, which, in turn, protects the Earth from lethal solar radiation.
Plate Tetonics, once thought of as a pretty farout theory, measurements now show that the US and Europe are spreading apart abut two inches a year. Which brings us to the discovery of the strange creatures living in the bottom of the ocean around thermal vents. These require no oxygen, thrive on gases that would kill most, and need no SUNLIGHT. The more I learn, the more I realize how little I know!

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Insanity: doing the same thing over and over again and expecting different results.
Albert Einstein