25.3 and 25.4 Flashcards
what is the boundary that marks a density change
discontinuity
how can discontinuity’s be identified
seismic waves
what is a shadow zone
where no seismic waves are detected
another term for a shadow zone
dead zone
what degrees from the epicenter do shadow zones fall
between 105 and 140 degrees
is the outer core solid or liquid
liquid
is the inner core a solid or a liquid? why?
A solid due to the pressure
what is the lithosphere
the crust and uppermost mantle
what is the asthenosphere
a plastic like layer that tectonic plates move on
what metallic materials make up the core
iron and nickel
what elements make up the mantle
calcium, magnesium, iron, and aluminum
what is molten rocks called
magma
where is the ring of fire
around the Pacific Ocean
what forms when tectonic plates collide along subduction zones
volcanoes
which two specific places can volcanic activity occur due to divergence
mid Atlantic ridge and east African rift valley
