passage: Earthquakes seemed to outline a special feature of earth 's crust .
  Earthquakes let scientists know where the crust was moving .
  This led to the discovery that the Earths crust was broken up into regions , or plates .
  Earthquakes happen most often along these plate boundaries .
  This was evidence that continents can move .
  The movements of the plates are called plate tectonics .
  The Earths crust is divided into plates .
  There are about a dozen large plates and several small ones .
  Each plate is named for the continent or ocean basin it contains .
  Scientists know he plates are in motion .
  They now know the direction and speed of this motion .
  Plates do nt move very fast .
  They move only a few centimeters a year .
  This is about the same rate fingernails grow .
  So you might wonder , what could cause this motion ?
  What supplies the energy to cause this change ?
query_and_answer: How fast do plates move ? || Very fast
evidences: Plates do nt move very fast . They move only a few centimeters a year .