broken by a fault or faults

...EPICENTER---point of earth's surface

directly above an earthquakes focus

...FOCUS---very dense, solid center of the earth

that is made of mostly iron with smaller

amounts of oxygen, silicon, sulfur, or nickle

...PLATE---surface along which rocks break

and move

...SEISMIC WAVES---energy waves that are

produced at and travel outward from the

earthquakes focus

rock underground suddenly breaks

along a fault. This sudden release of

energy causes the seismic waves that

make the ground shake when 2 blocks

of rock, or plates are rubbing against

each other, they stick a little.

subduction zone or its fault

sometimes the lava doesn't just harden and cool... they crack in the

earth and create tension in the earth. this also is what creates the

pathways for rivers and streams for water to goo through