chapter 25.3 and 25.4 Flashcards
(30 cards)
what is the boundary that marks the destiny change between layers
discontinuity
how can discontinuities be identified
seismic waves
what are shadow zones
areas where so seismic waves are recorded
what is another name for shadow zones
dead zone
between which 2 degrees do shadow zones fall between
105 and 140
is the outer core a solid or a liquid
the outer core is a liquid
is the inner core a solid or a liquid? why?
a solid because of the pressure
what makes up the lithosphere
the crust and upper most mantle
what is the asthenosphere
a plastic like later which earths plates move on
which elements make up the mantel
calcium aluminum iron and magnesium
which elements make up the core
iron and nickel
what is the measurement of a fluid´s resistance to flow?
viscosity
the chemical compound silicon dioxide is SiO2, which is a common ingredient in most magma
silica
what tends to be small, has heights in the hundreds of meters range, and have short eruption cycles
cinder cone volcanoes
these are broad, flat structures composed of layer upon layer of lava flows
shield volcanoes
these are large and steep-sided, often thousands or meters high and tens of kilometers across the base, and composed of layers of both lava and ash
composite volcanoes
what is molten or liquid rocks stored inside earth
magma
where is the ring of fire located
the pacific ocean
what is created when tectonic plates collide among subduction zones
volcanoes
what are 2 specific examples of volcanic activity due to divergents.
mid atlantic ridge and the east african rift valley
are hot spots stationary
yes
what is created from hotspots
islands (hawaii)
if a liquid has a higher viscosity will it flow more quickly or more slowly
more slowly
if magma has high viscosity will it contain more or less silica
more
