There are fault on line because when the Earth was first created. Some fault lines are on land and other are in the water.
For example think of this like a puzzle on land imagine the lines are like puzzle pieces the lines on the west cost might be higher then on the east cost it's like that some times.
There is more faults in the west cost their are more land fault line and in the east cost there is more ocean fault lines. And Alaska they have sea quakes because it's chose to the ocean and they have big earth quakes because it's in the west cost.
So billions of years ago their were dinosaurs around. Before their were the 7 continents it use to be this huge Continent called Pangea.Under the Earth the magma went in a circle convection currents and that is why the continents are separated.
It move an inch every years it took a very long time for the continents the split apart.
The Magma goes in a circle and the circle has to go down into the Earths core so that is why is why it took a very long time for the continents to be separated.
In millions of years the continent with come back together because if it keeps on separating then the continents can hit each other. for example if the continents keep on separating North America and asia can also hit each other so the magma works like this trench is an under water valley.
Maybe people so created building and vehicle's that are a lot stronger then the Earth Quakes so the hugh Earth Quakes can not knock vehicles and buildings.
These day inside buildings if they is a hugh Earth Quake any body will feel the building shaking. In the future if there is a hugh Earth Quakes nobody will feel the building shakes and buildings will not fall down because they are a lot strong then the earth quake and the buildings will have no damage the buildings will be just fine.
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