Earthquakes and volcanoes Flashcards
define focus
point of earthquaje
epicenter
point directly above the focus
what is an active volcano
volcano that has erupted recently
dormant volcano
has not erupted recently but could in the future
Extinct volcano
unlikely to erupt again, no magma inside
features of shield volcano (2)
Gentle slopes, slow flowing lava
features of cone volcano
steep slopes, violent eruption
what is a composite volcano mixed of and madee of
cone, shield volcanoes, made of ash and lava
define oceanic crust
younger, heavy, can sink bc it is being replaced and destroyed
define continental crust
old, light, cannot sink because it is permenant
when does collision occur
when 2 continental plates move towards eachoter
constructive occurs when……..
2 plates move away from eachother
when does conservative happen
when 2 plates slide past eachother
Destructive occurs when………… dubduct con pl
oceanic plate is subducted by a continental plate