the earths crust and the mantle are made out of 12 huge slabs of rock
what are earthquakes
earth quakes form when two tectonic plates move against each other
how an earthquake may happen
because of friction the plates cannot slide smoothly. sometimes they get stuck. huge friction builds up. eventually the 2 tectonic plates overcome the frictional force and they slip
why most volcanos form at plate boundaries
because underground rock can get hot enough to melt
