25.3 and 25.4 Flashcards
what is the boundary that marks a density change
discontinuity
how can discontinuity’s be identified
seismic waves
what is a shadow zone
where no seismic waves are detected
another term for a shadow zone
dead zone
what degrees from the epicenter do shadow zones fall
between 105 and 140 degrees
is the outer core solid or liquid
liquid
is the inner core a solid or a liquid? why?
A solid due to the pressure
what is the lithosphere
the crust and uppermost mantle
what is the asthenosphere
a plastic like layer that tectonic plates move on
what metallic materials make up the core
iron and nickel
what elements make up the mantle
calcium, magnesium, iron, and aluminum
what is molten rocks called
magma
where is the ring of fire
around the Pacific Ocean
what forms when tectonic plates collide along subduction zones
volcanoes
which two specific places can volcanic activity occur due to divergence
mid Atlantic ridge and east African rift valley
are hot spots stationary
yes
what are created from hot spots
Hawaii
if a liquid has a higher viscosity, will it run faster or slower
it will run slower
silica
common ingrediant in magma
if magma has a higher viscosity, how much silica is there?
more silica
what is pyroclastic material
solid material from a volcanic eruption
what is the smallest pyroclastic material
ash
what gases are created by volcanic activity
water vapor, sulfur, carbon dioxide, sulfur dioxide
how are volcanoes classified
size, shape, and erupting materials
what are the three different types of volcanoes
cinder cone volcanoes, sheild, and composite
sheild volc
high temp, low viscosity,
