Summary:

  • A rock under enough stress will fracture.
  • There may or may not be movement along the fracture.
  • If there is no movement, the fracture is called a joint.
  • Faults can occur alone or in clusters.
  • A cluster of faults creates a fault zone.
  • Earthquakes happen when rocks break and move suddenly.
  • Unlike what some people think, California will not fall into the ocean someday.
  • The land west of the San Andreas Fault is moving northeastward, while the North American plate moves southwest.
  • Someday, millions of years from now, Los Angeles will be a suburb of San Francisco!
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