Plate boundaries Flashcards
what are s-waves
slow
dangerous
move side to side
what are p-waves
first to arrive
not dangerous
move up and down
what is the focus
the place inside Earth’s crust where an earthquake originates
what is the epicentre
the location on the surface of the Earth directly above where the earthquake starts.
Destructive plate boundary
when a oceanic plate and a continental plate meet causing the denser plate to submerge. As the oceanic plate is submerged it melts creating magma which breaks to the surface to form deep sided compute volcanoes. Eruptions are often violent and destructive.
Constructive plate boundary
two plates are moving apart. magma is firing its way to the surface . as it breaks through the overlaying crust it causes earthquakes. on reaching the surface it forms volcanoes
Conservative plate boundary
two continental plates going past each other. They either move in opposite directions to each other or in the same direction but at different speeds . Earthquakes occur as the plats jerk past each other
Destructive plates cause
Earthquakes and volcanoes
Constructive plates cause
volcanoes
Conservative plates cause
Earthquakes
how are earthquakes formed at destructive and conservative plate boundaries
as the plates collide or move past each other they get stuck and pressure builds up .when the pressure gets too much it breaks and releases form the focus causing an earthquake