Plate tectonics and plate boundary by piboo

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

Contin­ental crust- thicker but less dense
Oceanic crust- Thinner but denser

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"