Question: After an earthquake, and all the ground has broken apart how would it be fixed because the cracks would be really deep I’m guessing??

Tim Craig answered on 11 Jun 2018:

Actually, no. Earthquakes result from one piece of rock sliding past another, rather than moving apart. This means that there isn’t really a crack that opens up, except occasionally right at the surface. The sort of ‘cracks’ you sometimes see on the news after earthquakes are rarely more than a few meters deep, and often as the result of ‘secondary’ process triggered by the earthquake (e.g., landsliding), rather than the earthquake itself.

Also – as you go down into the Earths crust, the pressure of all the overlying rock gets immense very quickly, to the point that is you did open up a crack, it would immediately collapse closed again.