chapter 25.3 25.4 Flashcards
what is the boundary that marks density change between layers
discontinuities
how can discontinuities be identified
by using seismic waves
what is a shadow zone
is where no seismic waves have been recorded
what is another name for shadow zone
dead zone
what are the degrees that shadow zones fall between
105 and 140
is the outer core a solid or a liquid
liquid
is the inner core a solid or a liquid and why?
solid because its the pressure
what makes up the lithosphere
the crust and uppermost mantle
what makes up the asthenosphere
plastic like layer which earth’s lithospheric plates move
which elements make up the mantle
calcium, aluminum, iron, and magnesium
which elements make up the core
iron and nickel
the measure of a fluid’s resistance to flow
viscosity
the chemical compound silicon dioxide, SiO2, which is a common ingredient in most magma
silica
tend to be small, have heights in the hundreds of meters range, and have short eruptions cycle
cinder cone volcanoes
are broad,flat structures composed of layer upon layer of lava flows
shield volcanoes
are large and steep-sided,often thousands of meters high and tens of kilo meters across the base,and composed of layers of both lava and ash
composite volcanoes
what is molten or liquid rocks store inside earth called
Magma
where is the ring of fire located
The Pacific Ocean
what form when tectonic plates collide along subduction zones
volcanoes
what are two specific locations have volcano activity due to divergent
east African rift valley and the Mid Atlantic rift valley
are hot spots stationary
yes
what are created with hot spots
islands(Hawaiian islands)
if the viscosity is higher is it going to faster or slower
slower
if magma has high viscosity is it going to have more or less silica
more
