Chapter 25.3 25.4 Flashcards
what is the boundary that marks density change between layers?
discontinuity
how are discontinuities identified?
by using seismic waves
what are shadow zones?
areas where seismic waves arent recorded
whats another name for shadow zones?
deadzone
what degrees do shadow zones fall?
105-140 degrees
is the outter core a liquide or a solid?
liquide
is the inner core a liquide or solid?why
a solid because the pressure
what makes up the listhosphere?
the crust and uppermost mantle
which elements make up the mantle?
calcium aluminum iron and magnesium
which elemnts makeup the core?
iron and nicle
what is multon a liquide rock stored inside earth called.
magma
where is the ring of fire located?
along pasific ocean shoreline
which two specific places have volcanic activity due to diversions.
mid atlantic ridge and the east african rift valley.
are hot spot startionary?
yes
what is a measurment of a fluids resistance to flow?
viscosity
if the viscocity is high will the fluid flow more quickly or slower?
more slowly
what is the chemical compound that is common ingrediant in magma
silica
if magma has a high visocity will it contain more or less silica
more
what is pyroclastic material?
any solid material that erupts from volcano
what is the smallest type of pyroclastic material?
ash
what is the largest type of pyroclastic material?
volcanic blocks and bombs
what variety of gases cause a volcano to erupt?
water vapor,carbon dioxide,and sulfer dioxide.
what happends when sulfer dioxide mixes with water?
it reduces the amount of solar radiation reaching earth.
eruptive style is strongly linked to what?
temperature and composition.
what are volcanos classified by?
size,shape,and materials that erupt.
when do cinder cones volcanos erupt?
when tempatures are high,gas-rich,and basaltic lava.
what valcano types are broad,flat structures composed of layer upon layer of lava flow?
sheild volcano
