Chapter 25.3 Flashcards
how can discontinuity be identified
seicimic waves
what is a shadow zone
where no seicmic waves have been recorded
what is the boundary that makes the density change
discontinuity
what is another name for a shadow zones
Dead zones
what degrees do shadow zones fall in
105-140
is the outer core a solid or liquid
a liquid
is the inner core a solid or liquid why ?
a solid due to pressure
what is the asthenosphere
the crust in the upper most mantule
what mattalice meterials make up thecore
iron nickle
is the measure of a fluid resistance to flow
is the measure of a fluid resistance to flow viscosity
the chemical compound silicon dioxide/ common ingredient in magma
silica
tend to be small and have heights of hundreds of meters and have short eruptions
cinder-cone-volcano
are broad flat structures composed of layers upon layers of lava flow
shield volcano
are large steep sides often thousands of meters high and tens of km across the base and composed of layers of both lava and ash
composite volcano
what is liquid rocks stored in earth called
magma
where is the ring of fire located
pacific ocean
what forms when techtoinc plates collide along a subduction zone
volcanoes
which two locations do volcanic activity occur
mid-Alantic ridge East African rift valley
do hot spots ever move
no
what are created from hot spots
hawii volcanic islands
magma with high viscosity more silica
what are the types of liquids that come off a volcano
cabondioxide sofer
how are volcanoes classifed
size shape metails and eruption
what are the three types of volcanoes
cinder cone,shield,composite
