CH 25 Flashcards
(30 cards)
what is the boundary that marks the destinty change
discontinuity
how can discontinuity be identify
sasmic waves
what are shadow zones?
areas where no seimic waves are reported
whats another name for shadow zone?
dead zone
between which two degrees do shadow zones fall
between 105-140 degrees
is the outer core a solid or liquid?
its a liquid
is the inner core a solid or liquid? why?
solid because of the pressure
what makes up a lithosphere
the crust and the uppermost mantle
what is asthenosphere
plastic-like layer which earths plates move on
which elements make up the mentle
calcium,aluminum, iron and magnesium.
which elements make up the core
iron and nickle
the measure of a fluid’s resistance to flow
Viscosity
the chemical compound silicon dioxide
Silica
are large and steep-sided
composite volcanoes
tend to be small,heights in the hundreds of meter range, and has short eruption cycles
Cinder cone valcanoes
are broad,flat structures composed of layer upon layer of lava flows
Shield Volcanoes
what is molten or liquid rocks store insideearth?
magma
where is the ring of fire located?
Pacific ocean
what is created when tectonic plates collide along the subduction zone
valcanoes
what are two specific examples of volcanic activity due to divergents
- mid Atlantic ridge
- east African rift
are hot spots stationary?
yes
what can be created from hot spots
islands (Hawaiian islands)
if a liquid has a higher viscosity, will if flow more quickly or more slowly
more slowly
if magma have high viscosity, will it contain more or less silica
more silica
