types of plate tectonics
tectonic plates moving can cause:
earthquakes, mountains, volcanoes, ocean ridges/trenches, subduction
Plate tectonics theory:
the entire lithosphere of the earth is broken into numerous segments called PLATES
Major plates and Minor plates
Continental crust- thicker but less dense
Oceanic crust- Thinner but denser
Four layers of the earth
the epicenter is where the vibration is and the focus is the exact location of the earthquake.
the graphical record of an earthquake is called "SEISMOGRAM" and its device is "SEISMOGRAPH"